What is the time period of this Esso heavy cardboard poster? I don't see a date anywhere. My guess is late 1950s early 1960s? Anyone know anything about these posters?

Ehhh, judging off the pump, a 996 and the Uniflow oil , I'd say no newer than about 1955. By 1956, Esso and Gilbarco were pulling the older 966's out and installing the Salesmaker 1002 pumps . Esso Golden was introduced in some markets in 1956 too. Esso dealers were sorta the first on the block to have a Super premium in addition to just plain ethyl .

Thanks for the great information.