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You likely have a set built between 1919 and 1930. If you go to this site ( The history of the telescope the binocular ) and scroll down (or search) to areas with Zeiss Binoculars, there are a number of files that have the information on runs. In my case, I looked at the Spreadsheet attached to the Zeiss Binocular Models entry, which , between lines 150 and 168, notes that binocs with the Lena logo were made from 1904 to 1945, and that serial numbers above 1 million began in 1919 and above 1,550,000 began in 1930, putting your pair in there more or less in the middle.
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.
You'll need to measure your eyepiece in "mm". Also determine if your eyepiece has an outer ring the eyepiece will slip over. You can find eyecups/guards on Ebay. Search under Binocular Eyecup or Binocular Eye Guard. There are also eyecups under "rubber eyecups/rubber eyeguards" but alot of these are for Microscopes and may not fit. You will need to pay close attention to the mounting type and measurements.
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