I think your best bet is going to be searching ebay for 'Vintage scope" and/or searching for specific makes. In that time period Hensoldt, Zeiss, Ajack, Oigee, Emil Busch, Dr. Walter Gerard and Kahles were all making fine scopes. A lack of American importers kept Americans from becoming familiar with many of them. As stated they won't be sealed, most will be elevation adjustable only, and age can certainly have taken a toll on glass quality. That said I have several that don't appear to have ever been serviced and they are still really clear. Most will have an odd post or number 1 reticle but you can sometimes find them with a crosshair or a number 4. The reticle will move from center when adjusted so keep that in mind when mounting. I'd definitely say pay more for a good one than trying to cheap out. It seems like the nicest are generally still on rifles and once removed the quality quickly deteriorates (or maybe that's why they were removed). One nice thing is that they are really easy to take apart and clean or re-blue if necessary. Mounts were often soldered to the scopes back then and you will find many that still have half the mount on them. Maybe that's a good thing for you maybe not? The tube and objective diameter's are all over the place. The small tubes seem pretty standard at 22mm but the larger ones range from 25-27.5mm and I've found very few sellers that can measure properly. The non-coated lenses don't give you the same low light capability that we're used to now. If you get a nice one they're still very usable, but I wouldn't take one on a once in a lifetime hunt.
