A very nice addition Jonas!
These can often be found in quite good condition. These are referred to as a "Deformed leaf, vertical crimp" and are unmarked. They have been attributed to Wilhelm Deumer.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)
Very nice deformed leaf ISA. Stewy
a real beauty.
Thanks for all the comments