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From my dad:
The Stallard frame pre-dates the Campag cast rear dropout and, like just about everything else of that era, has dropouts formed in flat metal plate. So it will take a Simplex, or a Cycle Benelux, or a Campag Gran Sport rear derailleur providing that you have the accompanying hanger which came as standard with all these mechanisms. With the Stallard frame, there’s a hanger already in place, held there by a single screw. See photo. Therefore, fitting a Gran Sport changer should be no problem.
The down tube levers are conventional braze-ons, at the moment with Huret levers – ie, French, a rival to Simplex, therefore metric.
Is the Stallard for cyclo/simplex type derailleur and levers only or will the rear dropouts braze on take a early Campagnolo gran sport etc?