I guess 11 days and 100 visits is enough, I private messaged the owner, over a week ago, but it is still sitting in my out box. The spoon is made in the Lorraine region of France. The first mark is that of Dominique DEROCHE 1782-1786 without going into the idiosyncrasies of Lorraine’s system it is the equivalent of a wardens guarantee mark for silver of the second standard, the standard of Lorraine, .792 fine. The A, under the DD is the letter for city of Nancy.
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The next mark is the makers mark IFG and a thistle, for Jean-Francois GROLLET.
born 1752, master 1777, again this is a different system than other parts of France, but I simplified it.
The thistle is the symbol of Nancy, common on maker’s marks there, and is on the coat of arms of the city. The style of the spoon is obviously French or as Trev said Swiss.
Finally the first mark is found in Tardy, I just checked. I guess a book does not an expert make. Our German friends get a pass on this one, as Nancy was not the part of Lorraine that was once German.
Maurice