Your medallion is not in the Nevada Promo Token book, Jill. A similar one without the loop and with a different portrait of Wilbur Clark is listed, and is valued at $30-40. I would guess these are souvenirs of the celebrity golf tournaments that were held at the DI for many years. I'd value it at $10-20 and probably have a collector who would be interested if you want to sell it. Can you tell me the diameter in mm and specify the kind of metal it's made of?

DonL