Kochmann Korelle Sport Prototype

possibly the only existing prototype of a 6x6cm viewfinder camera with coupled rangefinder, collapsible front with bellows and strut, focal plane shutter B, 1-1/1000 sec., bayonet mount, Xenar 2.8/7.5cm no.1308390 (according to Hartmut Thiele 'Großes Fabrikationsbuch Schneider-Kreuznach' this lens was one of 100 Xenar lenses reserved for the Korelle Sport - which never reached the market), top plate engraved 'KORELLE Sport', professionally crafted prototype camera in top condition, with original unmarked case, ex Spira Collection - published in 'Photographica Cabinett 65, Septmber 2015' on front page