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Shell metric/french threaded. Serial may turn out to be best clue to identity. Have seen before this placement and format but cannot recall a name to go with it. One possibility is Urago. Chainset and headset appear like they may be original to cycle while other fittings are not. Blades have been pressed together. Original spacing would have been 100mm. Are pedals Lyotard model 36? Not enough light to tell if they are Lyotard or Eclair. Spot of brass on top tube may indicate removal of braze-on or it may just be the filling of a ding for this latest respray. Appears to have been sanded for this present respray. Also just conceivable it could be Swiss; not an assertion.

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