The Automat- as famous as the New York Skylineitself

This unused postcard shows the Automat.  it says-

One hundred and fifty-six HORN & HARDART Automat-Cafeterias, Restaurants and Retail Shops in New York and Philadelphia serving over half a million patrons a day."

It also gives a brief promo for the New York World's Fair, so I am thinking this one came out in 1939.