"Of course, the method used can easily be forged but not 501/500. I hope our members are smarter than that BUT there could
be many 220/500 etc. Since this is issued by a casino, I consider it a 'varient' of the regular issue just as the numbered chips
from the Fiesta used in this years club auction are a varient of THEIR regular issue chip......"I don't see the difference."

I see no way to argue with that logic!!
One is put on with a sharpie by maybe Joe Shomoo in Oregon in order to get a bigger price on ebay and one is engraved at the factory in Maine.
OK, I give up!! "I don't see the difference either."