Rollei Rolleiflex DBGM 3.5F #2296629 Analogue camera

The Rolleiflex 3.5F is one of the most iconic and refined twin-lens reflex (TLR) cameras ever produced. It is a high-end professional model, made in Germany by Franke & Heidecke (later Rollei) in Braunschweig, between 1958 and 1976.
The abbreviation 'DBGM' that appears on many specimens stands for
German Federal Utility Model
that is, 'utility model registered in Germany' — it is not a specific model variant but an indication of a German patent engraved on certain parts of the camera (for example, on the front plate or the light meter).
Technical data sheet – Rolleiflex 3.5F
Type: Medium format twin-lens reflex camera (TLR)
Format: 6×6 cm on 120 film (12 shots per roll)
Viewing goal: identical, but without diaphragm and shutter.
Shutter: Synchro-Compur (1 sec – 1/500 sec + B exposure)
Aperture: from f/3.5 to f/22
Focus: manual via side knob, helical system.
Mirror: a reflex mirror with a magnifying lens and a foldable flap.
Exposure meter: selenium type, coupled with the shutter speed and aperture controls (later models).
Filter attachment: Bayonet Bayonet II (Bay II)
Exposimeter not tested
Weight: approximately 1.2 kg