To anyone who can help,

I was given a gaming chip recently and would like some information about it. It is a french chip from Monaco, that much I know...it is a plastic(or bakelite?) chip, red in color, 1 1/2" in diameter. the bottom half of the chip has an intricate inlay that is very detailed and is reminisant of a peacock's tail feathers in full spread. the top half of the chip is resessesd and has the chip denomination. (in this case, 20) just above the amount are the following words: SOCIETE des BAINS de MER de MONACO. Both sides of the chip are identical except that one side has a stamped serial number at the top of the chip.
Any info as to age, the casino of origin, etc. would be greatly appreciated, thank you.