Unique to the Rolleiflex Automat and letter model cameras, the mechanical wind mechanism was robust and clever, making film loading semi-automatic and quick.
This mechanism started the exposure counter automatically, auto-spaced the 12 or (on the later model F cameras) 24 exposures, and tensioned the shutter; all with less than one full turn of the film advance crank.
The standard deviation on these cameras is enormous. Compur Rapid shutter 1/500 to 1, B T ( early versions Compur to 1/300 ). Synchro Compur shutter 1/500 to 1, B T and MX sync with EVS system.
Mechanics should be working fully, but may need a CLA service. You should also budget $ 150-0 for a good CLA ( clean, lube and adjust ) if you plan to use the camera regularly.
Pricing was gathered from sales on photo.net, ebay auctions, KEH.com, Kohs.com, and other camera dealers. In fact, many cameras that have had professional CLA's done by folks like Fleenor or Krikor, can demand much more on ebay ( in part because these CLA/repair fees can run $ 300-400 ).
The Rollei Franke & Heidecke company was established in 1920 in Germany, and its cameras became a TLR standard.
In 1982, after filing for bankruptcy, Rollei was bought by United Scientific Holding (UK).