The two original Tengors - 54/2 and 54/15 - were produced by Goerz before the merger into Zeiss. They had an all leatherette finish, two vertically arranged finders and the film advance knob at the bottom of the side panel. Following the Zeiss merger the new company's logo was added to the camera front. In 1929 the camera was re-styled, two close-up lenses were added, the finder windows were arranged horizontally across the top of the camera and the film advance knob moved to the top of the side panel.

In 1932 the front of the camera gained a bevelled edge and a hexagonal surround to the lens. The controls for aperture and focusing were moved to the front panel. The model 54 had a single close-up lens. The 55/2 had a linkage between the shutter and film advance.

Box Tengor Models

According to Tubbs the Baldur camera (c. 1934) was renamed Erabox in 1938.