Fred, IMO that is not a factory stocked sporting Mauser and the DST is not any I have seen out of Oberndorf.

I too have talked with Jon and his books are based on a huge archive of original Oberndorf documents he has amassed over the years including original glass plate negatives. Very interesting fellow; he has accumulated more data that he can possibly sift through in his lifetime.

I have all his books and anything Mauser I go there first.

Art