The Altiflex is a German TLR camera made between 1937 and 1949 by Eho-Altissa in Dresden. It makes 2¼-inch square pictures on 120 roll film. There are four models.

https://camera-wiki.org/wiki/Altiflex

Altiflex (original model)

The original Altiflex, from 1937, has the nameplate in a perpendicular font, in capitals (i.e. not in script font as pictured here). The lens is either an f/3.5 or f/4.5 Ludwig Victar or Rodenstock Trinar, in a Prontor II or Compur shutter. The viewing and taking lenses are the same (some TLR cameras have a wider-aperture viewing lens). The camera is focused using the lever on the right side. The hood has a hinged focusing loupe. The shutter is cocked manually. On the example pictured in McKeown, the release is also on the shutter, but he states that better examples have a body release linkage (as shown on the Altiflex I pictured here).

To load the film, the back, bottom and both sides detach. The film is wound with a knob on the right of the body. Film advance is checked through a red window on the bottom.

At least some of the cameras have the old series of aperture markings (f/3.5, 4.5, 5.3, 8, 12, 18 and 25).