35mm Kochmann Korelle K half frame camera 18x24mm and unusually it has a Carl Zeiss Jena Tessar 3.5/3.5cm , most of the ones I see have the f2.8 version. A vintage camera with normal small signs of use from it`s 90 + years of life ( circa 1932 ) The shutter works and even the slow speeds seem accurate but I cannot set T or B. I can only release the shutter via the trigger on the lens housing without a film in and there`s no take up reel / cassette  but I`ve tested the top plate shutter release which works by manually winding the dial inside the pressure plate and it works well. The iris works well , the frame counter goes up to 90 ?? and the tiny Tessar lens needs a bit of a clean up if you intend to use it , minor fungus and also some haze but no scratches I can see. Free UK P&P .