Hi, I am Winston from Canada and am trying to look up a mark found on what I believe is an early american coin silver tankard. It has the marks J. P. G. on it and looks quite early. The interior has hammer marks, while the exterior is finished, and the bottom is also hammered. I have checked all the usual suspects as far as the mark goes in my limited library, as well as some very good mark sites on the web. Not sure if I can/should post pictures here, but any help would be appreciated.