Yeah, the EG versions are the best put together. It's kinda' subtle and may not be noticable to some people who don't pay attention to anything other than does it shoot, or does it not shoot, but the blueing polish job was nicer, there are fewer machine tool marks inside and the EG's run a little smoother and tighter than the rest of them. Mine are 1960, 1961, 1962, and 1964. Maybe the best is the one with Marschall grips above and the worst is the rubber grip skinny one below.
The BB gun is one that I'd forgotten was here until someone started a thread about them. I just posted it as a joke, but I'd let it go for a decent collector price.
Some Russian versions or periods were very noticably shabby, and most all early Chinese were pretty bad. The first Bulgarian I had was very rough but a later one was nearly as nice as the German guns.
I dumped all but the Germans several years ago. Had one of the double stackers for exactly one firing with one mag and then handed it to a buddy and said "Here, It's yours" My lasting opinion of those things is that it ranks right up at the top of the list of POS guns I've had, and over the years I've had a LOT of guns.