TBICR, there were four 9MMk Lugers made by Mauser, Whereabouts of 2 are known, one in France and one in the US, last estimate of value was over a million each and that was 20 years ago. But relying on memory.
If I wanted a gun to take to the range that would last more than a few boxes of ammo, I would buy neither the Erma nor Stoeger. There are no available source of parts for either, and neither have good durability reputations , especially the Stoeger. JMO, your money.