Hi,
It's a Silens Shutter - with the double S (snake like) symbol, often misconstrued as Luc Shutters - something Steven has done, despite owning one back in 2016
http://www.largeformatphotography.in...st-S-amp-S-(-)
You can use a Sinar shutter cable to throw the shutter - there were several iterations of this shutter, one with a dial offering a fixed 1/60th shutter speed, a B and T dial turning option for front mounting on lenses.
They are practical alternatives for unwieldy barrel lenses to a Packard or Thornton Pickard style roller blind shutter.
Kind regards,
RJ
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