I recently obtained a pair of 12" f6.8 Goerz Dagor (Ser. III No. 6) cells. They are threaded and look ready to mount to a shutter, but which one!? I would really prefer to find an old shutter that already fits the cells rather than pay the costs to purchase a new shutter and have a machinist fit it. My initial guess when I saw them was that they fit an Ilex #4, but trying them out revealed that they are a little smaller in diameter (~59mm front, ~56mm rear) than the cells of my Ilex #4 mounted 12" Ektar. Any idea what shutter these cells may have originally been mounted in?
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