I happened to bid on an auction (well, you know, just clicking here and there, etc etc) for a Rolleicord II (model 1, K3) which I won. In beautiful condition for its age, seems to work in all ways although the screen is a bit dim. Works fine on sunny days.
All good ... except one thing - I realised that the small swing-out loupe is gone. Per the manual, it was detachable since one could get different diopters for the camera. Finding one of these as a spare part is probably pretty much impossible.
So now I have to either fiddle around with an extra loupe, always using a tripod or buy another