Mr. Briggs' U.S. Postal Service ID number, which is visible on his hat, is 414.
Briggs the Postman first appeared in The Addams Family Goes to School (1964), with badge #524. He made 4 appearances total.
Mr. Briggs the postman is played by Rolfe Sedan who had experience dealing with craziness many years before, when he played Mr. Beasley the postman on the Burns and Allen show and had to deal with Gracie Allen.