Your free-play token is probably about 20 years old, Marc. There two similar tokens from Vegas World, catalog 837.0 is steel, and catalog 838.0 is aluminum. You should be able to tell which you have by the weight and hardness of the material. Also, the steel ones usually have some rust on them. The Nevada Casino Promo Token took estimates a value of $4-5 for the steel and $6-8 for the aluminum token. They are not particularly hard to find.

DonL