These were part of a large set of “postcards”. Actually, they have blank, gray backs. Possibly a collector’s set of cards? Dunno. This jet-powered strategic bomber was produced from 1956–1961. So, whatever this “card” is, they had to be released somewhere around that time. Here is the Wiki page of this aircraft. Quite an interesting history.
As a child, I had a blow up Smokey Bear almost identical to this in the photo. Apparently, he is celebrated his 75th anniversary. Interesting story about the origins of Smokey Bear here. Found in a thrift shop in Eureka Springs, Arkansas.
Use to do a lot of graphic design and always was in the market for older images to scan and incorporate into work. Those days have long gone by but I’ve kept all the old postcards collected over the years. Anyway, this looks to be 1950s or 1960s era postcard material.