Chuck - Top card is from 1996, when Harrah's started their "universal" card program. It is the first issue. Although it is not found very often now, it was a very common card, at the time. Lamb/Wells book lists it at $1.00

The bottom card is from 1992-93, when Harrah's first started their slot card program. Depending on what is printed on the back (there were 5 different issues), this card lists at between $7.00 and $20.00.

Although they are no longer current, once in a great while you might find one "laying around". This past September I found a Harrah's-Joliet (with the white "JOLIET" in the corner) at the Joliet casino. That card was from about 1993-94, but someone was still using it. Good luck finding those old cards. There are still some out there.