I believe this to be a nice early example. With a low award number.
I don't have any marked in this way yet.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)
This is a nice original Leistungabzeichen with the AD Schwerdt Stuttgart pin plate.
I believe it to be the earlier example sometimes found with a 'B' number
All the best
Thank you for your answers that helps me a lot