Hi, Rene--
These magenta-colored cards were used at the Sands as "introductory" slot cards. The way it worked was this: Sign up for temp. card with number (but not your name), plus you got a free coffee mug. Play until you reached a certain number of points, then trade your temporary card in for a personalized permanent card with your name on it. This would have been a very common card at the time. Don't know how many may have survived.
Time frame was 2 to 3 years before they closed I think, but just recalling from memory.
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