Per Hartmut Thiele's
Fabrikationsbuch Photooptik II Carl Zeiss Jena your 6.3 210 mm Tessar s/n 5902857 was one of a batch of 50, production of which started 29 April 1960. Further it was originally in a barrel mount. According to Arne Cröll a total of only 125 post World War II Carl Zeiss Jena 210 mm f/6.3 Tessars were mounted by the factory in the No. 1 Compur shutter, see here:
https://www.arnecroell.com/czj.pdf I think his source is Thiele.
I don't think it's uncommon to see examples of these original barrel mount Tessars that have subsequently been mounted in a shutter. I have one, s/n 7,209,548; one of a batch of only four for which production began 29 July 1965. Its No. 1 Compur doesn't have a serial number.
David
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