Please check out my 2 unique AC prototype chips on ebay. I got them years ago from the table games manager. As you can see they were never produced for table use (though the 2nd was released one year later for 1997 New Years)

http://www.ebay.com/itm/Harrahs-Atlantic-City-Prototype-AC-Casino-Chip-/281154162484?pt=LH_DefaultDomain_0&hash=item4176180f34

http://www.ebay.com/itm/Harrahs-Atlantic-City-Prototype-AC-Casino-Chip-2nd-Listing-/281154162832?pt=LH_DefaultDomain_0&hash=item4176181090