It would not be unheard of for a small maker to use barrels from Germany. There were a few gun makers who only produced a few guns a year.

If you could provide pictures of the proof marks and the markings on the barrels, etc, it may help a bit. This is not a cheap gun. However, an unknown maker can drive down the price. If there are trademarks on the barrel flats or receiver, it may tie the gun to a better known name.

Pete