The listing, Marlborough Hotel Asbury Park NJ 1920s POSTCARD has ended.
This card was originally glued in an album at the top edge. Over the years, the glue dried, and the card popped out. However it left a layer of glue on the back of the card which has beveled the card slightly at the top, so it is not perfectly flat and it's a bit stiffer where the glue is. It's a great card, but study the scans. It probably would lay flat if something heavy was put on it for a while.