Im new to this site and to collecting and identifying silver , but I have looked at every picture on here, and only came up with a wild guess. I think it might be Glasgow, Scotland because of the 2 lions on the front, the back has two stamps a "H" or "X" stamp but Im not sure. There is another stamp on the top right corner of one of the keys. 2 of the coins are dated 1788 and 1778.
X
X