Image
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Dates issued
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Design
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Serial format
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Serials issued
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Notes
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1906
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White on blue porcelain; "PENNA 1906" at top or at right (see Notes)
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12345
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1 to approximately 14000
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Plates with serials 1 through 99 had the state abbreviation and year at the right. This practice continued through 1909.[1]
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1907
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White on red porcelain; "PENNA 1907" at top or at right
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12345
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1 to approximately 20000
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1908
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Black on yellow porcelain; "PENNA 1908" at top or at right
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12345
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1 to approximately 25500
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1909
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Black on white porcelain; "PENNA 1909" at top or at right
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12345
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1 to approximately 34500
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1910
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White on black porcelain; "PENNA", aluminum keystone and "1910" at left
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12345
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1 to approximately 33500
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1911
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Black on yellow porcelain; "PENNA", aluminum keystone and "1911" at left
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12345
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1 to approximately 44000
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1912
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White on woodgrain-colored porcelain; "PENNA", aluminum keystone and "1912" at left
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12345
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1 to approximately 60000
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1913
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White on green porcelain; "PENNA", aluminum keystone and "1913" at left
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12345
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1 to approximately 80000
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1914
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White on black porcelain; "PENNA", aluminum keystone and "1914" at left
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123456
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1 to 19999; 40000 to approximately 115000
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1915
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White on medium blue porcelain; "PENNA", aluminum keystone and "1915" at left
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123456
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1 to 19999; 30000 to approximately 164000
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1916
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Embossed black on orange; "PENNA", keystone and "1916" at left
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123456
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1 to 19999; 30000 to approximately 231000
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First embossed plate.
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1917
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Embossed white on brown; "PENNA", keystone and "1917" at left
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123456
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1 to approximately 312000
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1918
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Embossed white on black; "PENNA", keystone and "1918" at left
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123456
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1 to approximately 368000
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1919
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Embossed red on black; "PENNA", keystone and "1919" at right
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123456
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1 to approximately 450000
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1920
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Embossed white on navy blue; "PENNA 1920" at bottom
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123-456
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1 to approximately 529-000
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1921
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Embossed black on golden yellow; "PENNA 1921" at bottom, with keystones on either side
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123-456
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1 to approximately 634-000
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1922
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Embossed brown on cream; "PENNA 1922" at bottom, with keystones on either side
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123-456
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1 to approximately 765-000
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1923
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Embossed golden yellow on navy blue; "PENNA 1923" at bottom, with keystones on either side
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123-456
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1 to approximately 986-000
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Six-digit plates were originally 16 inches in length, but reduced to 15 inches later.
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1924
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Embossed navy blue on golden yellow; "PENNA 1924" at bottom, with keystones on either side
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123-456
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1 to 999-999
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A-12345
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A-1 to approximately A-49000
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1925
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Embossed golden yellow on navy blue; "1925 PENNA" at bottom, with keystones on either side
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123-456
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1 to 999-999
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A12-345
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A-1 to approximately B58-000
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1926
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Embossed navy blue on golden yellow with border line; "1926 PENNA" at bottom, with keystones on either side
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123-456
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1 to 999-999
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A12-345
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A-1 to approximately C59-000
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1927
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Embossed golden yellow on navy blue with border line; "1927 PENNA" at top, with keystones on either side
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123-456
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1 to 999-999
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A12-345
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A-1 to approximately D63-000
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1928
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Embossed navy blue on golden yellow with border line; "PENNA 1928" at top, with keystones on either side
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123-456
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1 to 999-999
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A12-345
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A-1 to approximately E25-000
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1929
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Embossed golden yellow on navy blue with border line; "1929 PENNA" at top, with keystones on either side
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123-456
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1 to 999-999
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A12-345
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A-1 to approximately F24-000
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1930
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Embossed navy blue on golden yellow with border line; "1930 PENNA" at bottom, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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Letters I, O, Q, T, W and X not used in serials; this practice continued until 1974.[4]
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1931
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Embossed golden yellow on navy blue with border line; "PENNA 1931" at bottom, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1932
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Embossed navy blue on golden yellow with border line; "PENNA 1932" at top, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1933
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Embossed golden yellow on navy blue with border line; "PENNA 1933" or "1933 PENNA" at top, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123
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1934
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Embossed navy blue on golden yellow with border line; "1934 PENNA" at bottom, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123
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1935
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Embossed golden yellow on navy blue with border line; "1935 PENNA" at bottom, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1936
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Embossed navy blue on golden yellow; "1936 PENNA" at top, with keystones on either side
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1937
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Embossed golden yellow on navy blue with state-shaped border; "1937 PENNA" at top
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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Later plates had keystones on either side of the year and state abbreviation.
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1938
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Embossed navy blue on golden yellow with state-shaped border; "1938 PENNA" at top
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1939–40
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Embossed golden yellow on navy blue with state-shaped border; "1939 PENNA" at top
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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Valid through March 31, 1940.
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1940–41
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Embossed navy blue on golden yellow with state-shaped border; "1940 PENNA" at top
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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1941–42
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Embossed golden yellow on navy blue with state-shaped border; "1941 PENNA" at top; "EXP. 3-31-42" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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1942–44
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Embossed navy blue on golden yellow with state-shaped border; "1942 PENNA" at top; "EXP. 3-31-43" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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Revalidated through March 31, 1944, with red tabs, due to metal conservation for World War II.
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1944–45
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Embossed golden yellow on navy blue with state-shaped border; "1944 PENNA" at top; "EXP. 3-31-45" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1945–46
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Embossed navy blue on golden yellow with state-shaped border; "1945 PENNA" at top; "EXP. 3-31-46" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23
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1946–47
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Embossed golden yellow on navy blue with state-shaped border; "1946 PENNA" at top; "EXP. 3-31-47" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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1947–48
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Embossed navy blue on golden yellow with state-shaped border; "1947 PENNA" at top; "EXP. 3-31-48" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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1948–49
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Embossed golden yellow on navy blue with state-shaped border; "1948 PENNA" at top; "EXP. 3-31-49" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3
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1949–50
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Embossed navy blue on golden yellow with state-shaped border; "1949 PENNA" at top; "EXP. 3-31-50" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB
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1950–51
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Embossed golden yellow on navy blue with state-shaped border; "1950 PENNA" at top; "EXP. 3-31-51" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB
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1951–52
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Embossed navy blue on golden yellow with state-shaped border; "1951 PENNA" at top; "EXP. 3-31-52" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B
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1952–53
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Embossed golden yellow on navy blue with state-shaped border; "1952 PENNA" at top; "EXP. 3-31-53" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B
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Only rear plates issued; this practice continues today.
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1953–54
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Embossed navy blue on golden yellow with state-shaped border; "1953 PENNA" at top; "EXP. 3-31-54" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B
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1954–55
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Embossed golden yellow on navy blue with state-shaped border; "1954 PENNA" at top; "EXP. 3-31-55" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B A12B3
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1955–56
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Embossed navy blue on golden yellow with state-shaped border; "1955 PENNA" at top; "EXP. 3-31-56" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B A12B3 A1B23
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1956–57
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Embossed golden yellow on navy blue with state-shaped border; "1956 PENNA" at top; "EXP. 3-31-57" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB A123B A12B3 A1B23
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Later plates used the thinner serial dies that would be used on most plates of the 1957–58 base. T and W briefly used as overflow letters in serials.[4]
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1957–58
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Embossed navy blue on golden yellow with state-shaped border; "1957 PENNA" at top; "EXP. 3-31-58" inside top border
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12345 A1234 1A234 12A34 123A4 1234A AB123 1AB23 12AB3 123AB
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123456
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100000 to approximately 880000
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Narrower serial dies.
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