Hi bill
I worked in Germany a couple of times over the years and once visited the Waffenmuseum (Weapons Museum) at Suhl, Thuringia, Germany. They may be able to help you and if they can't they may know a man who can.

Address:
Waffenmuseum Suhl
Friedrich-König-Straße 19
D-98527 Suhl
Phone: 011 49 3681 72 06 98
Fax: 011 49 3681 72 13 08
E-mail: info@waffenmuseumsuhl.de

The only lessons in my life I truly did learn from where the ones I paid for!