Dick...on all the G mints, from all the casinos that used GDC or CT, you also have to check the overstamping. One strike will have a "G" mint overstamped on the GDC or CT and the next issue will have the "G" but it will have been a new minting. Only for the most industrious collector, but still a different strike. Often the placement of the mint mark is slightly different on the newer strike. You are absolutely right about the Bally's...Peter