2 exposures in a single frame

2 exposures in a single frame. On the left, the negative is blank. On the right a bust shot of a young man wearing a white shirt. Location: Tamil Nadu, Karaikudi, Vasen Studio. Date of original material: unknown. Size of original print/negative: 4 ¼ x 3 ¼ inches (Quarter). Format of original material: Glass plate black and white negative.