A quick look, finds braze-on derailleurs in mid-Eighties catalogues of Campagnolo and Shimano.
What other braze-on fittings are there?
Is the routing over or under the BB and chainstay?
Could even be slightly earlier, '82 Gios has braze-on, the earliest I have seen (have been too lazy to check other makes).
@Colin_the_Bald started
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A quick look, finds braze-on derailleurs in mid-Eighties catalogues of Campagnolo and Shimano.
What other braze-on fittings are there?
Is the routing over or under the BB and chainstay?