• So you need a 6-speed (or narrow 7) screw-on multiple freewheel and some kind (pretty much any kind) of rear dérailleur with a more or less matching lever. I'd stick to 1×6 for simplicity's sake.

    yes but which period correct levers, derailleurs and crank? :)
    those miche monolithic are hard to find and the suntour blaze look crap.

    thanks

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