I thought it might be worthwhile to post some images showing the 3 main types of Erkennungsmarken issed by the Heer, Luftwaffe and Waffen-SS, and examples of how they age.
The first is aluminum- mainly used before and early in the war:
The unit is 2. Kompanie, Gebirgs Nachrichtens Abteilung 54- part of the 1. Gebirgs-Division
Here's a corroded aluminum disc:
As you can see, there's a lot of white, crystalline deposits on the metal, and aluminum so corroded will actually become quite brittle. This unit is 3. Kompanie, Panzer Abwehr Abteilung 560, an independent Panzer Abwehr Abteilung that fought mainly with the 11. Armee in Russia.
The first is aluminum- mainly used before and early in the war:
The unit is 2. Kompanie, Gebirgs Nachrichtens Abteilung 54- part of the 1. Gebirgs-Division
Here's a corroded aluminum disc:
As you can see, there's a lot of white, crystalline deposits on the metal, and aluminum so corroded will actually become quite brittle. This unit is 3. Kompanie, Panzer Abwehr Abteilung 560, an independent Panzer Abwehr Abteilung that fought mainly with the 11. Armee in Russia.