Original German WWII RAD Unit-Marked Tornister 34 Pony Fur Backpack by Walter Ducksch with Shoulder Straps - Dated 1938 Technical Books Engraved into the prop is

Engraved into the prop is an Army Air Service Insignia

Kirschbaum & Company

as used by the Germans in WWI

Note that rendaku ("sequential voicing") causes kasa to change to gasa when it is preceded by another word specifying the type of hat: thus

Original German WWII RAD Unit-Marked Tornister 34 Pony Fur Backpack by Walter Ducksch with Shoulder Straps - Dated 1938 Technical Books Engraved into the prop isOriginal Item. Only One Available. These cowhide covered rucksacks were known as the Tornister (Knapsack) Model 34 (developed in 1934) and this unit marked example comes complete with the correct shoulder straps. It looks to have all of the leather components still present, showing light to moderate wear from service. As the war progressed the design was simplified for economical and practical reasons so the cowhide cover was eliminated making these