From Leica Wiki (English)
- Production era - 1935-1940
- Type - Trigger operated rapid-winder in black and nickel, black and chrome, and all chrome; the first version had a spring strip that was soon replaced by steel tape for safety. Used on Leica IIIa (model G), Leica IIIb and Leica IIIc
- Reference - Page 22 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus.
- Forum discussion