Well, I guess I just got lucky
I've seen these sets, more or less complete, from time to time on eBay.
I bought it, not for the socket wrench, but for the sockets itself.
First, I'm not willing to spend a lot of bucks for new sockets from Gedore or Hazet if I don't need them everyday.
Second, I like old tools and when they're doing their job, why don't use them?
And yes, they're not just made like a tank, they're heavy, too! In Poland, socket breaks you!
BTW: I got the original box for the sockets, too. But I don't have any use for it. Any ideas? Don't have the time to restore it or something...