2 exposures in a single frame

2 exposures in a single frame. On the left, portrait of a man wearing a white shirt. On the right, portrait of a policeman in his police uniform. He wears a shirt and a police cap. No backdrop. Date of original material: [1954]. Size of original print/negative: 3 ½ x 2 ½ inches (2B). Format of original material: Glass plate black and white negative.