Just found there were two versions of the 12th issue Caesars Emperors Card from the Caesars Palace in Las Vegas, NV. These are the card with the slot reservations phone number centered on the bottom of the back and 5 lines of Caesars locations pattern on the front. The difference is that on one card the front logo is 22mm high and on the other it's 24mm high and slightly covers part of the background pattern.

Here's scans of the two fronts, 22mm first then 24mm logo last so you can see the difference, plus the common back which is identical on both cards.