The Ritter Brothers were a pair of New York area bodybuilders who both posed nude and photographed others that way between about 1932 and 1945. Nearly all of the pictures
of them are unattributed as to photographer, and there is a chance that some of them,
including this one, were done with timers as self portraits. These two would pick up men
at gyms and take them home for photo sessions and who knows what else.