I have Carl Zeiss Jena Tessar lens cells with a SN of 385893. I'm trying to determine what type/make of shutter this may have been in, and any measurements, thread size, pitch, etc. etc. that may be available. The only thing I can guess is that a 6 digit number places it early in the century.
1:6,3 f=25cm.
Thanks in advance.
George
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