This is a ten cent gaming token issued by "RWM" for Caesar's in Atlantic City, N.J. It's an undated (1980s? 1990s?) thin brass 22.2 mm arcade token. Except for the "RWM," it's similar to an arcade token identified as issued by the "Olde Philadelphia Mint" that is listed as
Numista #337561 and
TC #521503. "RWM" may be the former Roger Williams Mint in Attleboro, Massachusetts. If so, it is now part of the TokensDirect division of Osborne Coinage in Cincinnati, Ohio.
So all that rabbit chasing is to say it is yet another of the zillions of virtually identical 1980s or 1990s arcade tokens.

Here are the mug shots:

