Contax I
The Contax I is a high-end 35mm rangefinder camera made by Zeiss Ikon to compete with Leica models. It was released in 1932. The Super Nettel was based on the Contax I, with the same kind of shutter but a folding body, a fixed lens, and a short-based rangefinder. It was intended to be a cheaper alternative. Wiki.

Contax I Version 7, c. 1936
Zeiss Ikon, Dresden. No. Z.46018, with Tessar 2,8/5 cm no. 1912045 and filter G1, rangefinder viewer unresponsive (unclear whether this is a Contax device variant for the folded base. Number Z.25653 ). The shutter works fine. I didn't see any problems with speed. Unfortunately, the lens has balsam and dust.
*I did not test it with a film.*
 
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The first model of the Zeiss Ikon Contax was introduced in 1932, and it was a pioneering camera that set the standard for 35mm rangefinder cameras. It was designed and manufactured by Zeiss Ikon, a German company known for its high-quality lenses and camera systems.
The Contax was a manual camera that used 35mm film and had a coupled rangefinder system, which allowed the photographer to focus accurately on the lens. It was also equipped with a leaf shutter, which allowed for fast flash sync speeds and the ability to use a variety of lenses.
One of the critical features of the Contax was its high-quality lens, made by Zeiss and known for its sharpness and clarity. The camera was also equipped with several advanced features for the time, including a built-in light meter and the ability to set different exposure modes.
Overall, the Zeiss Ikon Contax was a highly regarded and influential camera that set the standard for 35mm rangefinder cameras and helped to establish the Contax brand as a leader in the industry.