Just purchased a beautiful 305 Schneider repro claron. I want to mount it in a shutter, front mount would be acceptable. I know that some repro clarons will mount in a copal or compur #1, this one won't, the front and rear lens cells are the same size and are approximately 44 or 45mm. This is a newer model black finish repro claron barrel mount with serial number 11418105. I have a compur #1 and the front cell of the repro claron is too large for it and of course the rear cells are also too large. I also have a compur #2 shutter for a Xenar 180 4.5 that I believe is classified as a compur II/6. The front and rear cells of the repro claron are too small for this shutter and the barrel is too large for this shutter so it won't front mount on the Compur #2. I have a Copal #3 shutter and the barrell of the repro claron is too small to mount on a copal #3 as a front mount. I was hoping to save some money by purchasing a used shutter as opposed to having it custom mounted. Does anyone know whether this lens would be a direct fit for an Alphax or Betax #3 or whether it would front mount (the barrel threads are approximately 53 or 54mm) on any available shutter. I would prefer to avoid using a Packard shutter if possible.