Another choice Rollei treasure: The clever and oh-so-useful 6x4.5 rotating film back for Rollei 600x cameras. I am the original owner of this lightly used and mint condition accessory. I just installed new batteries and all appears to be working as expected.
The back takes 120 (or 220) roll fill. Orientation of the film cartridge can be changed from landscape to portrait by simply pulling it off the back adapter, rotating it 90º and snapping it back into the adapter.
The back and adapter will come in their original boxes. Included are the instruction books for both pieces as well as the original finder mask.
$350 shipped and Paypal'ed or best offer (CONUS only, please).