From J.B. Bonsall estate.  Original medium format (2.25 X 3.25 inch) B&W negative of J.B. Bonsall posing in a suit on the California coast.  Image taken by Bonsall in 1946 just after he returned from WWII.

Probably shot on 620 or 120 format roll film, which were in common use in box cameras and folding cameras typically employed for tourist snapshots.