J & J Cox NYC Coin Silver Sugar Tongs

Heavy coin silver sugar tongs, 6 and 3/8 inches long by John and James Cox of NYC, working 1817-53. Because of their weight and style I would place them at 1850-3. They have a patented design I have not been able to identify, which is similar to the "Empire" design of John Polhamus of NYC. Marked "J & I COX N.Y. PATEN" in a rectangle on one interior side and with what appears to be a patent registration mark in a diamond design on the other.