Problem is that these fakers aren't in it as an intellectual exercise; they are in it to make money.
Every time we detect one of their technical errors, they can read what we have discovered, correct their error and then fleece the next poor chap who comes along looking for either a scope for that rifle he bought when he was a kid.... or a better pickup-truck so he can go to work a little more efficiently. That's the scale of the money involved.
Somewhere, there is a factory with really decent lens-grinding equipment and a few very good technicians, turning these things out. It could be a man-and-a-boy operation or it could be a bigger place that made up a batch and is releasing them a few at a time to select customers, sitting back and having a laugh. Who has current-day experience in manufacturing brand-new World War Two scopes? Who actually hates us enough to do this? Alternately, who doesn't really hate us any longer, but has a wicked enough sense of humour to get a laugh from this?
The original scopes were made during World War Two, in the second-best optical industry in the world. The best optical industry was in Germany. Where did the German lens-grinding machines go in 1945? Who has them and still is using them? For quality of image, these lenses require hand-finishing. Who, today, has the world's best lens-finishing technicians? Remember, everyone else has gone over to CNC finishing. What are these scopes sealed with? Silicone? Betcha not: too modern. Originals would have been sealed with Canada Balsam. There is, as far as I know, only one place in the world left which still was sealing with Canada Balsam only 20 years ago; they still have the knowledge and the expertise.
There are the clues, gentlemen. Do with them as ye will.
But this has to be stopped.
What's next? Counterfeit VCs?
No: that one's already been done!
Repros must be marked as repros. Mark them unobtrusively, but they must be marked.
