Check this page from my site concerning the Rex. Also shown are thyw three known c=crest & seals. If you hunt around you can find my page on the Tango with a special, one of a kind Tango chip

BTW, the $10 & $50 are a good deal more expensive than the $5 Rex.

http://www.oldpokerchips.com/NonNevada/SSRex.htm