
The 40k. stamp shows a vessel with the name Cooperatzia on her bows but the only ship bearing this name mentioned in Lloyd's Register is one built at the Severney Shipbuilding Yard in 1929. This ship was often in London before the war and in the post-war period was on service between Rotterdam and Riga. I have some doubts however about her being the vessel on the stamp, which would appear to be a later ship, though she may have undergone alterations to her structure. The caption above the illustration of the vessel gives her service as Murmansk-Tyksi.
SG2329 Sea Breezes May 1960