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Thanks for the research op ... interesting ... ok ... check link below ... http://www.holgermerlitz.de/seven8x30.html
"Jenoptem" is the name given to a civilian version of the Zeiss Jena Deltrentis 8x30 binocular of Porro prism design
Jena, Germany ... incidentally is where Carl Zeiss AG was founded (1846)
Made a leap of faith with regards to spelling "Jenoptem" vs. "Jenoptum".
Carl Zeiss Jena is East German manufacture, that is why you don't find it in the Zeiss catalogue (it isn't Zeiss). It is also almost certainly post-war, as there was no East Germany before WW2.
Carl Zeiss Jena made inexpensive optical equipment for export to the West. The optical quality was fairly high, but not as good as the West German Zeiss, and the finish was less good.
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
Unfortunately if they are out of alignment you need to take them to a service center. It can't really be fixed at home without a device known as a collimator. Binoculars can fall out of collimation if they have been knocked or dropped. Jenoptems were made by the defunct East German Carl Zeiss Jena. Zeiss was split in two after WW2 with Jena being on the east. The current Zeiss firm is the West German company. Zeiss Jena ceased to be after the fall of the Berlin Wall. It is unlikely that the current firm would fix these for you. If they did the price would be greater than several pairs of Jenoptems.
Before you do take them check to see if they have a seven digit serial number. If it is six digits they are fake Jenoptems. There were many fake Jenoptems sold in the eighties by UK dealers. There is even a myth that they were made under licence in Japan. A myth is all that information is. There is no documentation to substantiate this and was probably spread by sellers trying to legitimise an inferior product.
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