One problem is that too many German guns are not "name" guns but guild guns or retailer names few here know. All the name first buyers are hard pressed to come up with more than two or three German makers.
I never was a fan of their engraving. Some think cheek pieces belong on rifles only. The wood often goes from plain to oak. Horn trigger guards look thick and clumsy to some. There are a lot of reason why German gun bring so little which is good for those who like them. Just not too good if you have one for sale.
