Riding a '37 Dayton Super Streamline
I saw that before as well but wonder if he ever got past a few prototypes in the prewar period because I can't say I have ever seen a bona fide prewar cambio drivetrain. V/r ShawnWhile doing some research on other Campy stuff I ran across this timeline referencing
the Cambio Corsa system. I am not sure if the 1934 entry referring to the advert means that it was published in 1934 also.
After fabricating parts in the backroom of his father's hardware store (Corsa Padova 101, Vincenza), Tullio starts Campagnolo, S.r.l. with the production of the quick release hub. The sliding hub, dual seatstay rod operated, back pedal derailleur (cambio prototype) is patented on May 4th and introduced in August. The pieces of the prototype derailleur are all handmade requiring a massive investment of time and labor. Fratelli Brivio of Brescia (F.B.) becomes the subcontractor for the parts and supplier of the three-piece (steel barrel with aluminum flanges) hubs. Later, the official corporate name becomes Campagnolo Brevetti Internazionali SpA (translation: Campagnolo International Patents Incorporated).
Cambio a bacchetta (translation: rod changer) or Cambio "CAMPAGNOLO" is the name used for sliding hub, dual seatstay rod operated, back pedal derailleur. The slogan becomes "Senza attriti e senza rumore" (i.e., Friction-free and noise-free). The first advertisement for the Cambio "CAMPAGNOLO" appears in Gazzetta dello Sport."
credit: velo-retro; Chuck Schmidt