I've been collecting these for about 5 years now. I've found 16 different of the 'I Hit the Jackpot' series. Some are Reno only, some are Reno/Tahoe. Some mention both Harrahs and Harrahs Bingo clubs in Reno. The ones that have postmarks are all dated in the 1950's.

I'd be interested in getting scans (or better yet, cards) that are not in the pic below.