I have Zeiss Jena Dekaris 10x50 ser 1740081 what can you tell me about these mfg date etc?
The manufacturer was Carl Zeiss AG in Jena, Germany. The serial number indicates a manufacturing date of between 1936 and 1940 (1,700,000 starts in 1936 and 1940 starts with 1,980,000) so your's is likely to be around 1936/1937. Some basic specs can be found here
If you're interested in the company history, have a look on wikipedia or check out the website of the Zeiss Historica Society
Hope that helps
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