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Now u say I think it could be Trev, that part of the mark is rubbed. There is a definite pellet between the letters. If i'm reading your thinking - B Lumsden? I convinced myself the fiddle pattern of the spoon would put it outside the dates I thought he worked.
I think date-wise it would be OK, Lumsden was working until 1785. Scottish styles and fashions lent more towards those of France, rather than England, and I believe the fiddle pattern was in use in France before it gained its popularity in England.