Leica's flash-sync slow-speed body — the IIIf Black Dial, coupled RF, cloth shutter, 1950.
The Leica IIIf Black Dial was the earlier variant of the IIIf, introduced around 1950, and was the first Leica to add flash synchronisation to the full slow-speed III body. The black-dial name refers to the black flash-sync numbering on the shutter dial that distinguishes it from the later red-dial version.
It is a 35mm coupled-rangefinder camera taking 39mm screw-thread lenses, with a horizontal-travel cloth focal-plane shutter, front slow-speed dial and synchronised flash. Focusing and framing use separate rangefinder and viewfinder windows, there is no built-in meter, and the shutter is fully mechanical and battery-free.
It suits photographers who want the fully featured slow-speed screw Leica with flash sync, and collectors who value the black-dial variant. The magnified rangefinder window helps precise focus, though it retains the two-window Barnack workflow.
Check whether the body is the earlier non-self-timer black-dial version, and verify rangefinder patch contrast and vertical alignment. Test slow speeds and the flash sync numbers, inspect the cloth curtains for pinholes and capping, and look for finder haze. Confirm smooth film transport and a clean mount.