There are a couple GN chips of that era that were cancelled that way, with the hole and odd slice thingy going on. C/W Official... pictures two diff chips, yours and a $5 lime smcrown hs next issue with that type of cancellation. Same in the Herz book, A Collectors Guide To Nevada Gaming Checks & Chips. Won't tell you the 1995 value Herz put on it! As for why, don't know, we'll wait for the experts, perhaps someone at GN just hated chips. Nifty chip BTW!