I know it's not a silver strike ... but it's housed in a similar plush blue color case as the $200's but it's much smaller in size than the $200. The airtight case measures 71mm across, the medallion itself measures 64mm. It's not marked silver ... so it's probably not. Might be nickel. No mintmark either. It has a proof finish with deep mirror-like surfaces. I had not seen one of these before and was wondering what the distribution was. A high-roller gift perhaps, to mark Caesars 25th Anniversary in A.C. in 2004??