Here are the only 3 I know of. They were all issued in 1997. I recently found some old notes I took when I talked to the guy that furnished the key chains for these chips. He gave me my 1st MGM Derby chip. He sold the marketing dept 3,500 key chains for the promotion of the 3 chips. That could translate to a max 1,150 of each chip. A former security guard (now retired) from the MGM sold me one each in Dec last year. He said guards got all that was left over. He also told me he had more and would contact me when he got home to Oregon. He has not done so, yet. If he does, I have a huge waiting list for them.