QUOTE(Scottishmoney @ Feb 11 2007, 03:59 PM) [snapback]301866[/snapback]
It is about 21-22mm.
This is conmemoration jeton dedicated to the peace with Turkey 1791 (btw it is Ekaterina, not Elizabeth). original jeton was in silver (like on your picture) and it is one of the most common of 18th cent. and gold (very rare). There are novodels in all 3 metals, one of the rarest novodels is from the set dated beginning 20th cent., made for MNS.
Your jetton is in F to VF condition and vast majority of these pieces show the sign of heavy circulation, which to my opinion confirms the theory - these jettons also served as payment means at that time. Mint state pieces are scarce, but still can be achieved.