A brief note en passant. I own one of these babies, now on long-term loan to a dear friend who adores Rolleis but lived on a low income and can't afford one and also shoots only black-and-white. She loves it and everything she shoots with it turns out eminently printable, as much from the legendary 'flex quality as the photographer's talent.
Which is the catch. This Rolleiflex has an uncoated Tessar and is best used shooting only B&W. Even when using a lens hood the image contrast is somewhat on the low side and a little extra developing should be given to the film for what used to be known as a "plucky" image. If shooting color neg one is best using consumer film and not the lower contrast pro films. Lovely pastel colors ideally suited to portraits. Landscapes less so.
I bought mine in the 1990s for A$130. For a long time they sold for A$100-$150 but prices have now shot up. Some Ebay sellers want up to A$750, which to me seems a triumph of hope over fantasy.
A bit off-topic but may be useful information to some.