Thanks Cheryl. I never said this was a conclusive identification, but only a possible line of inquiry for researching some unanswered questions: composition, maker, dealer, date.
What do we have? Samples of items with a mark said to come from the general area of upstate New York in an unspecified period (1800 - 1830?). It would be nice to find out what the "credible" source sampled and if they actually tested for coin rather than went on the basis of general knowledge of markings.
As to Curtis, online record shows Frederick Curtis born in New York (state?) circa 1816. He next turns up in the Hartford area circa 1830's - 1840's. He is a silver maker. He buys land. He opens F. Curtis & Co. And begins to use a mark that is now identifiable (samples online).
An item with the new mark is currently listed as "coin" but no mention of a test.
There seems to be a suggested dealer on the D-Eagles samples that is another dead end unless someone digs deeper.
Again, I am not making a conclusion but, whatever D-Eagles means, would you consider Curtis as one of the possible candidates to have made these items prior to his forming a Connecticut firm that is not very far from upstate New York, especially if someone does establish that he made items in coin? (admin edit - see Posting Requirements )