Zeiss Super Ikonta C- 531/2 with 105/3,5 Tessar Opton Nice RF, working shutter speeds , the 531/2 were designed for eight pictures 3 3/4 x 2 1/4 but could be used with mask (and VF mask ) to provide 16 2 1/4 x 1 3/4 negative , these cameras weighed 28oz Sold with Original brown Leather case