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@gbj_tester
They are just ordinary single pivot callipers. The Monoplanar concept involves one arm passing through a slot in the other. It isn't worth getting hung up about, as there is no real advantage - there is a theoretical reduction in bending of the centre pivot shaft, but that isn't usually something people complain about with normal brakes.
I don't know how many kinds of Monoplanars there were, definitely Veloce (which I have), Chorus, and Athena. Campag didn't go in for gratuitous changes from year to year back then, so I don't think there were any early/late models, as they didn't last very long before the whole range went over to dual pivots. Croce d'Aune and Record were Delta at the time, so the best Monoplanar was only mid-range.
The concept lives on in the M5 brake
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