The most extensive and reliable list is by Prochnow.
Please see the Books paragraph on the ‘Information for TLR Users’ page.
The "Rolleiflex" name is most commonly used to refer to Rollei's premier line of medium format twin lens reflex (TLR) cameras.
(A companion line intended for amateur photographers, Rolleicord, existed for several decades.) However, a variety of TLRs and SLRs in medium format, and zone focus, and SLR 35 mm, as well as digital formats have also been produced under the Rolleiflex label.
Similar to Leica values - the exact condition of the camera - will determine final price. Because there are many ways in which Rolleiflex cameras are categorized, this list may differ slightly to other lists.
Its best to utilize the serial # to identify your exact model and variation within that model line.
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.
For decades, Rolleiflex cameras would have a decisive effect on photographic history.
You may find a great guide on Rollei serial numbers at the Peter Rongsted Rollei page.
A Rollei company timeline can be found at Retrography.com; another source of extensive information is Rollei Club.
For the professional, the Rolleiflex was like a gift from heaven, it meant a radical change in his/her creative work.
Being able to work fast with a large size negative, light weight and superior quality made the choice as simple as important.