It is a real token that could be played when Riviera had $5 machines with coin acceptors. There are few limited edition tokens in Nevada, and most I've seen are of the higher denominations.

Riviera did do some special colored tokens like the Lucky Duck token below. Also a series of tokens with holographic images in the center.

Palms and Aladdin have also done a number of special tokens, some of them colorized or holographic.