Celtic was built with a steel hull and was spritsail-rigged.[3] She was used to trade around the coast of Kent and Essex, and the Thames Estuary, mostly in the brickmaking and papermaking trades, and was operated by E J & W Goldsmith for 38 years.
In 1941 she was requisitioned for war service, passing into ownership of the Ministry of War Transport, under the management of the London & Rochester Trading Co Ltd, and at that time was fitted with twin screws a pair of Bergius diesel engines.[1][4][5] She was used as a barrage balloon base at Portsmouth, later serving as a parent vessel in Chichester harbour during January 1943.[6] She saw further service in Scotland after this with Detachment Celtic; part of the RMBPD[6]
Postwar, Celtic returned to commercial service in the ownership of Vectis Shipping and, later, Alfred Horatio Sheaf, both of Newport, Isle of Wight.[7] She was mainly in the cement trade, working between Asham Cement Works on the River Ouse and the Isle of Wight. In 1967 the cement works closed, and she then worked between the Isle of Wight and Shoreham by Sea or Greenhithe[1] and was laid up at Newport in 1969.[1] She finally ended her days working in the ballast trade[4] in the Thames area.[1]