Here are some shots from a 1947 publication on Bars and Restaurants I found today in my school’s library.
Forthright disclosure in this department is definitely not in keeping, even where the service is offered in connection with a self-service restaurant. Although prominent citizens may properly assert they “have nothing to hide” in occasional temperate indulgence, they still don’t really like to do it on manifest exhibition. For this reason, the exterior of Tropical Gardens, though striving for attractiveness and compulsion in line with principles for the restaurant front, has much smaller window areas, with curtains as a rule nearly drawn, to reveal very little to the street of the activities and personages inside. Still the front should express, as Tropical Gardens attempts, particularly in the doorway, the essential nature and character of the operation, projecting all possible inducements to make the customer enter.