Only 2 bids so far on possably the only chips from the Green Ace Casino in Calexico California verified by TR King as 1961. I bet you dont have these. See the auction for scans of both sides.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=63756&item=3282966689

This may be your only chance to own a set of these.