Rare? Only 4 sets ever made, that's rare in anyones book! Most collectors never even knew they exsisted, and many that knew, have never even seen them.
The Hard Rock Pindex prototype 8 piece set is up for grabs at JackpotAuctions.com!
The Sammy $25's will surface soon...but with only four of these prototype in exsistence, it makes the Sammy quarter common by comparison.
A true treasure...here's the link:
http://www.jackpotauctions.com/cgi-bin/12345.pl?chips&1022981734

Take a look, feast your eyes, enjoy!