Jim,
The info Chuck gave you on the A.C. Playboy Roulettes is correct. Casinos often switch roulette table racks for various reasons including : moving roulette tables to a different part of the Casino, removing tables from play,etc. Each Casino has some "back up" roulette chips in the same way that they have "back up " regular chips.
As far as the Playboy Roulette with the "roulette" mold is concerned I don't believe this chip was used in A.C. since all the roulettes used at the Playboy were manufactured by Bud Jones and the roulette mold is a PAULSON mold.
I f you post a scan of the roulette mold chip, maybe some one would be able to tell us where it was used.
If your interested in collecting Playboy roulettes, e-mail me and I will let you know what chips I have in stock.