This is a Voigtländer Perkeo II, a folding medium format camera produced by Voigtländer AG Braunschweig of West Germany between the years 1952 and 1955.  The Perkeo was a mid-level camera that shot 6cm x 6cm images on 120 roll film, built to good quality standards with a quality 4-element Color-Skopar lens and Compur shutter.  The camera used a scale focus viewfinder and compact folding design that wasn’t much larger than folding 35mm cameras of the day, despite shooting images much larger than 35mm.  The Perkeo II was an update from the original Perkeo adding an automatic exposure counter and double exposure prevention.