B. Fischer & Company: Coffee Roasters

From an era when there were businesses that actually made something in New York and the Fourth Ward. David Diefenthaler probably walked to work from his Knickerbocker apartment.

Who's Who In Knickerbocker Village History: David Diefenthaler

In the 1940 census David was listed as a coffee roaster living with his wife Ruth at 36 Monroe Street. Shortly after he joined the Air Force.
More about B. Fischer and Co. and the Diefenthaler family:

Following the death of Benedickt Fischer in 1903 the firm passed under the control of William H. Fischer, son of Benedickt, and Mr. Diefenthaler. Mr. Diefenthaler is survived by a widow, two sons, Richard and David A. Diefenthaler, ... SAN SALVADOR— The 1919-20 coffee crop in El Salvador is estimated at approximately 100000000 pounds. ... Mr. Diefenthaler is survived by a widow, two sons, Richard and David A. Diefenthaler, a flight officer with the Army Air Forces B. FISCHER and CO. 190 Franklin Street NEW YORK Name: David Diefenthaler Gender: Male Birth Date: 21 Jul 1913 Death Date: 26 Dec 1970