After issue, very little attention was paid to Army issue or numbering stamps, as mags got lost, damaged and were replaced. So, practically any of the technically correct mags (stamped metal, extruded, plastic, aluminium or wooden base) could be considered "correct", depending on when the weapon was manufactured (no extruded or Schmesser mags on an early Lugers etc). Value here would be in the region of 60€.