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I got a message:
"This set was made by Gorham, bought wholesale by Clark unmarked, then stamped with Clark’s name. These were made with Machinery unavailable to smaller enterprises like Clark’s workshop.
No reference yet (I am in the midst of writing a history of the pattern), but I am 100% certain this was a retailed piece. I own hundreds of examples of Josephine, most bearing “COIN” and “1855” marks by Gorham, and wholesale retailers marks."
This sounds logical in that Clark was was more of a retailer than silversmith. I shared with him the picture of the Josephine pattern and noted differences particularly on the back of the spoon bowl.