Leica MBROO 1954-1961 Waterproof and Shock Resistant All Metal Case for the Leica F series camera with 50mm Summicron Lens.  ThisAluminum case with O-Ring was issued by Leica as the ultimate in protection for your Leica camera and lens.  For use when you are Sailing/Boating, Skiing, High Humidity or Water environments, Mountain Climbing or any Special condition situation where Water and Shock protection is needed to protect the camera and lens in Harsh environments.  The clamp on the front flips the case open/closed.  The camera can be in the case and still used without removing it from the case, just flip the front clamp and the camera will be ready for use.  A tripod thread is included on the bottom of the case for tripod attachment.  A difficult to find and Rare accessory that will fit your Leica III f or IIIg.