Original RK ASA. Whether RK is Rudolf Karneth has yet to be proven. Zinc ball hinge variant. Stewy
I agree with Stewy.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)
nice version with ball hinge. This type is also known with same catch and tin hinge: