Not Fremont, but Frontier Hotel, Allen. These are silver-clad, the proprietary technique that Franklin Mint came up with in the 60's. Everything you see is silver. Inside is base metal, kind of like the US half dollars were in the late 60's.

About 4000 were made between the collector sets and the ones made to play. Not too scarce, but an odd denomination for a token in those days. I'd say it's worth $5-10.

By the way, only the Frontier, Bonanza, Landmark and Reno Horseshoe had $2 tokens as of 1968. All but the Horseshoe were silver clad. Horseshoe's was bronze.

Many modern casinos do use them, of course.