Just received this today, literally haven't even knocked the dust off of it.
It is actually better than described in the listing I bought it from, in fact the seller said it only had one magazine. Perhaps he meant everything is part of the Oneness.
Can't wait to shoot it along side the 9mm one I already have, to compare the differences in the rounds - I've never shot a .30 Luger.
The safety is marked Gesichert (standard production) instead of Safety, the box is marked Interarms. Used what they had, I reckon. If I'm reading the tables correctly, it would have been made toward the end of 29/70 production in 1972.