Filmshooting

It is not unusual for gear from the 1940s to use mil-spec components. My best guess is that your projector was originally designed on a war contract. The cable may have standard PL-68 connectors or something like the Post Office 316 / B-gauge plug. If it was me, I'd consider reusing the 2 connectors...

Preston Sturges Akira Kurosawa Orson Welles Frank Capra Sidney Lumet Hal Ashby Martin Ritt Vittorio De Sica Ingmar Bergman Billy Wilder John Frankenheimer Jacques Tati Alexander Mackendrick Yasujiro Ozu Buster Keaton George Stevens Leo McCarey Ernst Lubitsch Luis Bunuel Howard Hawks John Huston Osca...