Hi,
I think that is the facsimile mark of the 18th century Williamsburg, Virginia silversmith and brass & bronze founder, James Geddy. The mark was used on reproductions of his work made in Williamsburg. Below is an example of a a reproduction of a Geddy silver bowl of made by Wm. L. Dematteo in the 50s or 60s that bears the same mark.
The archeological record shows that Geddy cast small mask ornaments in brass & bronze for harness fittings and the like. I would imagine your piece is a sterling repro of one of these. Surprised it does not have any indication, aside from the sterling stamp, to show it is a reproduction.
Regards, Tom

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