The Zep Diner was located at 515 W. Florence Avenue in Los Angeles near Figueroa. The Zep was open "all night" and was the "Home of the Hinden Burger". The location is now a McDonald's parking lot. Airships.net notes that the Zeppelin craze of the 1920's and 1930's brought the famous Graf Zeppelin to Los Angeles in 1929 as part of its round-the-world flight. Also, who could forget the USS Los Angeles, by far the most successful of the United States Navy’s rigid airships which was built in Germany by the Zeppelin Company.
Zep Diner matchbook. 
Artist Larry Grossman did his own version of the Zep Diner as part of his retro-themed lithography.
Smaller book of matches.
