This as far as I could ever find is just an odd one that they could use for whatever they needed. Maybe craps since they didn't have one of the odd games. I do not think this or their small crown blue, hot stamped chips were roulettes & nothing to match has ever been seen.
Other clubs especially downtown had an extra odd one or two. El Cortez with the black chips used as .10 & .25 for craps I was told by different sources years ago. I have an early Eldorado Club zigzag mold I picture in my book. Have only seen this one I own. They had a blue hot stamped no denomination too. Eldo had Faro. Many downtown clubs did.
The Rex, or SS Rex had 2 colored no denom's but they also had nearly every game. Roulette too & it is possible the other colors have just not come to light.