Im sorry i dont know. Wish i could help... i know there are some WW2 forums out there... maybe try those out. I know that Germany had several different scopes. Ranging from large high power scopes to small close quarters type scopes with only a 2 or 3 power magnification mounted on the rear sight forward of the action.
There's quite a lot of decent reading about WW2 sniping in Out Of Nowhere by Martin Pegler. All in all it's the most enjoyable book on sniping I've read so far. Not much technical info, but it is worth the money in my opinion. It's also fairly detailed on the history of riflescopes.
As for scope producing companies in Germany in that period...that is one heck of a long list. Zeiss at least produced the Zf4, Kahles produced something... Schmidt & Bender. All I remember is that there were several companies, and many are still going strong today.
If any one knows where to get the 10 power WW2 German scopes... original or reproduction... please let me know. I really want to scope out an old Yugoslavian M-48 Mauser i have but i want it to look WW2 original. Thanks
I am also interested in WWII optics and you might want to check out "The German Sniper 1914-1945" by Peter Senich and "Sniper variations of the K98k" by Richard Law. I don't own any myself but have seen several on ebay(including a german Ajack brand scope that went for $4,000!). Here are some sights you might find interesting. Hope this helps.
As I said, it's one hell of a long list. Basically all German companies producing optics today started off late well before optics on rifles was a common thing. Plus a long list of companies that has merged with others, changed names, or just gone bankrupt.