The same seller as the margueritta shifter is offering a 1957 Bates
Cantiflex repainted frame that looks nice, but includes "Rear Spacing -
126mm to accommodate a 5 or 6 speed freewheel" and "Dual Campagnolo
shifter bosses are original as are the various braze-on fittings."
I suspect the frame's been respaced, but a question to the list. When did the Campy shifter bosses start being made available for frame construction? Not connected to seller, blah, blah, ...