At the risk of information overload, at one time Copal supplied Schneider with No. 3 shutters with threads and tube length that matched the No. 3 Compound, see:
https://www.largeformatphotography.i...opal-3-Shutter
I have a 360 mm Tele-Xenar mounted in a No. 3 Copal. Its threads are consistent with the M55.69 x 40 threads per inch of the No. 3 Compound and its tube length is 37 mm, also consistent with the No. 3 Compound. These dimensions are not consistent with a standard No. 3 or 3s Copal, the No. 3 being threaded M58-.75 with a tube length of 32 mm and the 3s being threaded M56-.75 with a tube length 28.6 mm. By its serial number my Tele-Xenar was made circa 1967-1968. I have a hunch that it later years Schneider used the standard No. 3 Copal but I don't know that for sure.
David
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