2 exposures in a single frame

2 exposures in a single frame. On the left, bust-shot portrait of two young men in shirt, no background. On the right, bust-shot portrait of a middle aged man, no background. Location: Tamil Nadu, Karaikudi, Vasen Studio. Date of original material: [1953-54]. Size of original print/negative: 3 ½ x 2 ½ inches (2B). Format of original material: Glass plate black and white negative.