There is also an earlier magazine plate camera, the Perkeo No. 140 by Krügener.
There are three models of Voigtlander Perkeo; they are Perkeo I, Perkeo II and Perkeo IIIE, all use 120 film in 6X6 format. The Perkeo IIIE is top of the range and has an uncoupled rangefinder
Folding cameras were often marketed at different price levels though being fitted with different types of lenses and shutters. The top model might be fitted with a higher grade of lens (e.g. with more elements or wider aperture) and a more advanced shutter—and of course with a high price tag.