Konica IIIM 35mm Film Camera Rangefinder with Hexanon 50mm F1.8 Lens, Leather Case & Lens Cap in Near Mint Condition
The Konica (or Konica I) and its successors the Konica II, and Konica III are fixed-lens, leaf-shutter rangefinder 35mm (24×36mm) cameras that Konishiroku made from 1947 until 1959 or 1960. The Konica IIIM (March 1959) adds an exposure meter and half-frame capability to the faster (50/1.8) version of the IIIA - the self timer is moved to the side of the lens barrel.
The meter accounts for two add-ons: a device attached close to where the self-timer is on the III, and a flap hinged across the top that closes a set of selenium cells against the finder windows when the camera is not in use and opens them over the front when it is in use. The IIIM also came with a mask for half-frame photography. Inserting this and sliding a lever above the film take-up spool switches the camera to the appropriate film spacing and frame-counting systems. The finder windows are redesigned, such that two large windows appear.
The IIIM is the first Konica rangefinder camera to feature a built-in hot shoe for flash, but it is a non-standard type of unusual dimensions that cannot be used with most flashes. Konishiroku offered a Koniflash IIIM especially for the camera. That's a compact flash bulb holder with folding fan-type reflector. http://camera-wiki.org/wiki/Konica_(I),_II_and_IIIKo