Zeiss Ikon MBK 1000B 'Lichtbildmaschinengewehr'

very rare military gun camera used in WW2, developed by Zeiss Ikon for use on ground or in airplanes, used in a similar way as the Machine Gun 15, equipped with two bulky spring-wound drives and two film magazines for 22m film for 1125 exposures, with fast 1.5/2.5cm lens inside the front part and the original instruction book 'Kurzbeschreibung und Justieranweisung zur MBK 1000 B' (short instructions for uns and adjustment of the MBK 10000 B) - another camera was sold in our last Auction (Lot 485)