This post card, published by Beechcraft, was mailed from St. Louis in November, 1960. This aircraft, a Beechcraft Super G18 (G18S), was manufactured in 1959 for delivery in 1960. There were a lot of variants of the aircraft, but, in general, they were dual engine. This one has just the one. Part of the picture here was used as an advertising poster for this Beechcraft. On the back: “Top Speed 234 mph. Top Range 1,626 miles”.
The aircraft ended up in Nuku’acofa, Tonga, as part of their air medical service.