My Golden Nugget 50c is barely readable, as you mention most are, James.

I looked for a long time to find this nice The Mint $2.50 dovetail, though. Reverse is almost as strong a stamp.

Also, here's the Riviera $100 in a Keychain device as James mentioned. I kept mine intact, as I think the inscription on the reverse about the Teamster's Union function as almost as great a piece a history as the chip!

DonL