I picked this item up recently. It's a room number from Fitzgerald's Casino in Las Vegas (now "The D"). It measures 4.75" x 4.75" and is .125" thick. Looks to be made of brass and weighs 7.65oz. The brass numbers are on a dark green background with braille numbers below. Two mounting screws are included.

It's authentic. I thought if someone's house number was 2130 or they had some sort of affinity for this number, or for the Fitz, or for Irish shamrocks, or for Las Vegas casino memorabilia, this would be of interest.

I haven't researched what this might be worth, but would be willing to sell it or trade for it. You can contact me via e-mail if interested.