Ben Harris' illustrated cover for the sheet music of "I Discover A Million Dollar Infant (in a 5 and Ten Cent Store)" from 1931's "Billy Rose's Crazy Quilt" notes the show's stars and other credits in a pen lettered monoline design with rounded terminals.
This early Art Deco type style has now become the digital typeface Variety Store JNL (a reference to the Five and Ten Cent stores mentioned in the song title from the sheet music).
.Font Family: Variety Store JNL Regular