I think it's fair to say you don't see this much creativity put into the design of business envelopes these days.
In this case, Bennett Printing Company of Dallas, Texas, went all out with the design of its return address in the early 1930s. I can't find much concrete information about the company online, but there is some evidence that it was still in operation in the late 1970s.
The envelope was postmarked on November 30, 1931, in Dallas. (In a piece of trivia for you tonight, that is the same day that Bill Walsh, who guided the San Francisco 49ers to three Super Bowl championships, was born.)