For your consideration, here is a WWII 1945 Pan American Transocean Clipper Jumbo Postcard, used. The postcard was made by the Jumbo Postcard Co. and was post marked 25 June, 1945, Eugene, Oregon. It measures 8 7/8 by 6 3/4 inches.

This was from near the end of the era of the Clippers. It has a description of the use of Transocean Clippers and a World War 2 warning regarding the enemy on the back.

 

It has been folded in half, has a few creases in it. There is a line mark on the front and a 1/4 inch tear on the bottom edge. Item pictured is the actual item up for sale and comes from a non-smoking household. (131.225m-.3ob)

[Thanks for looking!]