Commanders of the Medium Mortar Units, December 1943
The abbreviation mGrW. stands for mittlerer Granatwerfer (medium mortar, 8cm). The interpretation "machine mortar"—sometimes found in lists of military abbreviations—is definitely incorrect, as Gruber explicitly mentions this designation in his diary. Incidentally, Gruber is the person on the right in the photograph.
Translated with Google.
