Coin dinner fork, Prob. "Leaf", John Polhamous, SY& Co

This is a nice dinner fork at 7 7/8". The condition is good with a small amount of tine wear and no other problems. The pattern looks like "Josephine" but is probably "Leaf" by John Polhamous. The retailer was "S.Y. & Co." whom I have not identified. NY,NY Ca 1850.