I have bought an old Falcon 10 speed from Edinburghs BikeStation recycling charity. Like most bikes sold from there its a parts bin special but well thought out. The bike sports a mixture of Suntour, Shimano, Campagnola, Weinman and TA bits with 27x1.25 tyres so more of a fastish tourer type bike.
One bit has me fascinated and thats the front mech by Campagnola. The chain shifter plates are attached to a post that emerges from the side of a flat box that is clamped to the seat tube. The cable pulls a lever on the left of the box and a single screw on the top of the box controls the shifter plates alignment.
What is this kind of mech, I've never seen anything like it but I think its well smart and intend to use it