These all honor the grand opening of some Desert Inn facility and I believe were issued near the time of the DI closing in 98 or 99. Not marked, but weigh 1 troy ounce each. One starting to tone at edges. Appear to be proofs and were well protected in air-tite holders.

Picked these up at the Convention and found I already had a set.

Yours for $22 each including postage.