There would normally be a serial number on the reverse. Your image on ebay indicates that there is no such serial number. Based on a cursory look at your ebay image it does appear to be a prototype of some sort. You can check out the token and the full set of these tokens on the strikers web site for related silver tokens. I do have two sets of these (with serial number) if anyone is interested. Unfortunately I bought them when silver was at a higher price. George L