From looking at other lenses I have from this manufacturer I find this is the lowest serial number of them all. I also know that when you open the gate in order to thread the film in an Andre Debrie camera the right hand film guide is automatically moved to the right to allow the film to sit flat on the gate before the pressure plate is put in place to hold the film against the aperture. This camera is a J. Debrie and has a spring loaded right hand film guide and is obviously an early movement.