2 exposures in a single frame

2 exposures in a single frame. Studio bust-shot portrait in one negative. Both portraits have been vignetted. On the left: a woman wearing a sari and a blouse. On the right side, a man wears a coat and tie and has a pottu on his forehead. Location: Tamil Nadu, Karaikudi, Vasen Studio. Date of original material: [1960]. Size of original print/negative: 4 ¼ x 3 ¼ inches (Quarter). Format of original material: Glass plate black and white negative.