Double studio portrait on one negative

Double studio portrait on one negative. On the left picture, a man wears a suit, a shirt and a tie. He looks straight at the camera. On the right photo, a young boy has a white shirt and a tie, the same tie as on the left picture. No backdrop. Date of original material: [1954-55]. Size of original print/negative: 3 ½ x 2 ½ inches (2B). Format of original material: Glass plate black and white negative.