Farley Granger wears an unidentified watch

Strangers on a Train (1951) is Alfred Hitchcock's thriller about tennis star Guy Haines (Farley Granger), drawn into a murderous bargain he never agreed to. On a train, he checks his wristwatch as he reads the newspaper. The watch is on his wrist, no maker legible, so it is recorded as an unidentified watch with the frame kept as evidence.