Pentacon Six
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The Pentacon Six is a single-lens reflex medium format camera system made by East German manufacturer Pentacon from 1966 to 1992. The Six accepts lenses with the Pentacon Six mount, a breech-lock bayonet mount. Wikipedia
Flange distance: 74.1 mm
Battery: 1.35 volt PX625, PX13 or equivalent (for metering TTL prism)
Film advance: Manual
Film format: Medium format 120/220 film
Film size: 56 mm x 56 mm
Flash: PC Sync
Lens: Interchangeable lens