1952 Leica IIf BD (Black Dial) is similar to the IIc but with flash synch added under the shutter speed dial. Black dial versions have black engraving for the flash synch numbers. All BD models have the old shutter speeds of 1/20, 1/30, and 1/60. A film type reminder is incorporated into the winding knob.The flash socket is adjacent to the viewfinder/rangefinder window on the back. This early version has a top speed of 1/500. An Elmar lens is attached.