Steve,
These Harrahs Reno Roulettes are listed on page 106 of The Chip Rack.
I have three of these "A" stamped roulettes in my collection, along with a dozen that are not stamped. There is also a listing for "B" chips but I don't have any of these. I don't know why these chips were marked like they are, it's a strange way to designate a different table or tables, since the center inlay colors would probably denote different tables. Note the inlay colors listed on page 105 are some of the same ones as the stamped chips, another mystery, why?? I don't know if this helps any but that's every thing I know about this series of roulette chips.
Mr. Roulette