This folder portrays the DJ-3A Dispatcher that debuted in 1955. I believe this is a 1956 folder and that the same materials were issued year after year with minor updates.
It was a two wheel drive version of the CJ-3A, which had been replaced by the CJ-3B in 1953. A right-hand drive model saw extensive service by the US Post Office. The CJ3-A was replaced by the DJ-5 in 1965.