Just received this card (bottom card in scan) in a trade today. It's from the Atlantic City Hilton. Reverse is exactly the same as the 5th issue. The most notable differences are: 1) the "waves" are golden on the old card, silver on the new; 2)the oyster/pearl has a brownish tint on the old card, grayish tint on the new. Has any one else noticed this? Pat/Steve, could this be a 6th issue? You make the call.