• Does anybody know whether an early '80s AB would take a band on or clamp on front derailleur?

    Most early 1980 AB frames will be for clamp band only.
    For AB, a braze on part has been optional for a very long period.
    I guess that in the early 1980s, the majority of AB frames didn't have a braze on for a front mech. At the late 1980s it was a lot different.

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