Here is one on Etsy like yours....
https://www.etsy.com/listing/1280883409/rare-baby-rolleiflex-original-4x4-rollei
Info.........
The original Baby Rolleiflex is a smaller version of the Rolleiflex, taking 4×4cm pictures on 127 film. It was introduced by Franke & Heidecke in 1931 (127,000-523,000). New variants followed in 1934 and 1938.
With this camera line Rollei was attempting to expand their already popular line of TLR Cameras by making a smaller variant for use with format 127 film. The first version of this camera was basically a 3/4 scale copy of the Standard model, of camera, with an exposed shutter and viewing lens.
This pre-war Baby Rolleiflex 1st model came with exposed shutter, with speeds set by the shutter dial (1931-1933). These cameras came with either a 6cm f: 3.5, or 6cm f:2.8 Tessar taking lens. This one is fitted with a more sought after f:2.8 lens.
All pre-war Rolleiflex cameras used a simple film transport, of the same design as the Standard. A spring loaded lever on the side of the camera, was turned clockwise, which advances the counter to the next number. Unlike the Automat film transport; this system required the user to load the film to the first frame, via the ruby window, and then reset the counter to the number one, with a small button.