The Materialprüfungsamt logo
The Materialprüfungsamt logo
The logo is a combination of the letter "M" and "P" which stands for "M"aterial "P"rüfung. Then there is the "Z3" code which was the materialcode for "Carbolic Resin (Bakelite) with a woodpulp filler" type 3. On the gripplates of "Viacowerke" there is an extra stamp with the "gbm" code. The "materialprüfung" code is does not contain a number code and remains empty. The handgrips produced by AEG had a small "38" code in the logo and no seperate code.