I posted this chip earlier in the week.
Delivered to the CC in 1957.
I have now received confirmation from the distributor, that it is indeed a roulette chip.
As far as I can tell, so far, this is the 1st one found of any color. Could be 304 more green ones out there.

"Dear Gene, The colors are: Blue, Red, Yellow, White, Lt Green, and Lavender. 305 each color."