Camera Heritage Museum - Leitz: Leica IIIc K grey 1940-1946. Same as the Leica IIIc but with ball-bearing shutter. Also with "K" (Kugellager) at the end of the serial number. Mostly produced
Tempered Indulgence, the Leica IIIc – The Thoughts & Photography of Johnny Martyr
Leica Leitz Wetzlar Camera IIIc War-Time [ RED CURTAIN ] 1940 CLA'D | eBay
Geschiedenis van Leica | Aleica
File:Leica IIIc red curtain 1940 (33587079976).jpg - Wikimedia Commons
Leica II later production 1940 very rare No. 352900, 1.388,00 €
Leica M6 - The Best 35mm Camera Ever Made - Review - Thorsten Overgaard's Leica Photography Pages