Did some searching and found out that this is a drum magazine for an MG FF 20mm cannon. It was used by the Luftwaffe from 1935. By 1941 it was gradually being replaced by the MG151/20. It was used on several aircraft such as the Me-109E3-F1, the FW190A1-A5, the Ju88, He-111, Do17, Do217, as well as many other aircraft. Later in the war it made a comback in the Me110 night fighters. Many G-series night fighters were retrofitted or factory-built with the Schräge Musik off-bore gun system, firing upward at an oblique angle for shooting down bombers while passing underneath, frequently equipped with two 20 mm MG FF/M. They fit perfectly to the back of the rear cockpit!
Now, having figured out what it's for, what you guys think it's worth?
Matt
