This isn’t a post card, but something extracted from a publication of some sort. I show both sides below. It’s 7.5 x 4.6″ and on a slick stock about the weight of presentation paper.
Incidentally, this is the aircraft that “Tex” Johnson, an experienced test pilot. rolled twice in 1955 in a flyover at the International Air Transport Association at Lake Washington, near Seattle. He was told not to do that again.