This discussion has come up before. The Luxor UV security code does have seven different versions (actually six, the seventh is no code). However, the early Luxor CHIPCOs came in a linen finish, while the current ones are all satin finish. Therefore, there are 16 different Luxor $1 chips.

Of course this does not account for the many, many "error" chips where two different codes appear on a chip, i.e., NILE on one side and PYRAMID on the other.

Anyway, I have an extra NILE, satin finish chip. Where do I send it?

Jim Follis