Stripper clip ID

Cany anyone help with the identification of this clip?

Length: 85.6 mm ( inside section without “fingers” 78.7 mm)
Width: 12.2 mm
Depth: 5 mm
Width between guidance for case groove resp. for diameter of case above rim: 8.7 mm
(measurements as positioned on image)

The clip (body and spring) is made if nickel plated steel and straight.

The only marking is a “H” in an oval.

This is a Hirtenberger-made stripper clip for 9 mm Steyr ammunition for Steyr M12 pistols.

Radom 1, thanks a lot for your help!