Yes that is Las Vegas I do agree.
Value I would say is double Art's book.

Now that MGM Vegas I have not seen!
There are many round ones but maybe this was a fancier one for the Metro Club. Who knows. Is it for sale or trade
Keep finding more ashtrays.
I found one today here in Santa Barbara at a thrift store. "Sultan's Table" with Dunes Sultan but does not have the Dunes names. It is a porcelain type.