Mostly in Europe, we understand items like this are (often) classified as “postcards” but Global Postcard Sales doesn’t normally list them since they are meant to be folded and somehow sealed together.  The unfolded item is as you see in the scan, though we deleted some commercial information.  If you were to flip that over, the reverse looks like the back of a normal postcard.  Arba Editions 503, measuring 6-1/4″ x 8-3/4″ unfolded.   Grade: 1