Longtime Campy Only reader Henrik sent in this photo of an unusual derailleur from the Golden Era:
Here is a special rear mech modified by the Banani shop in Copenhagen in the mid seventies. It's a mix between a Rally and a Super Record, so riders could get a light long cage shifter for mountain rides.
The Banani shop used to build frames as well, famous for their track frames. Rik Van Stenbergen, Freddy Maertens, Danny Clark etc. have all used Banani frames for 6 day Madisons, back in the golden track days.