Got the chip from Bruce as well. But from a little web research it looks exactly as you described. There are other chips in the series as well as you'd suspect (it would be a whacky tournament with just one denomination, and there are two different series)

2004 - http://www.worthpoint.com/worthopedia/harrahs-betting-on-a-cause-and-cure-charity
2003 - http://www.worthpoint.com/worthopedia/3-rare-harrahs-betting-on-a-cause-and-a-cure

(not my auction or information just did the googling)