Leitz Leica IIIc to Leica IIIf Conv. "Luftwaffen-Eigentum"

Leica IIIc to Leica IIIf Conversion, "Luftwaffen-Eigentum" engraved on back of the camera, Fl. No.38079 engraved on top plate, Elmar 3.5/5cm no.548164 with defaced engraving (some letters of the Luftwaffen-Eigentum engraving can still be seen), shutter curtain wavy, shutter not operable, Vulcanit with a crack on back but complete (no missing pieces), grey everready case with replaced brown top cover (flap needs to be stitched). Both items have been delivered in 1941 to Luftwaffe Berlin. The camera body on January 6th and the Elmar lens on April 1st 1941.