Wonderful set but there's something that worries me. The German Waffenamt Code 815 was issued to an Inspector at Steyr-Daimler-Puch A.G., Werk Graz, Österreich and used there from 1940 to 1945 . The reference I've found makes no mention of that Code ever being used anywhere else.
And whoever did the stamping didn't seem to care if he stamped over the company Logo or if the stamp showed clearly.
I'm wondering if this set could have been stamped post War.
Here's the site with the Information I found --
http://crufflecarp.org/crffl/waae.pdf
and 2 more --
http://www.gonefission.net/waffenamt.html
http://users.swing.be/sw017995/waffenamt.htm