Originally Posted by
repechage
C34 is I think a very good guess.
As written elsewhere, it was not that difficult at all to order specific details for even reasonably small orders.
12-25 bikes of one type could achieve that.
As the frame has been repainted, the braze-ons are suspect for original, but could be factory, leave them in place.
The drive side dropout has opened up under the pressure of a solid axle fixing nut no doubt.
If it was me, I would straighten the slot (12" crescent wrench on the derailleur mounting tab, done that)
Strip the paint and get a washer brazed in behind the end, cut away the section then filling the slot.
Maybe even do the other side of the frame too.
Refinish it, there are a number of colors it could be, graphics varied, and a number of examples with similar lugs to give a reasonable guide.
No doubt you have French threading here.
These ride very well, Bartin was late to the steep geometry party, and we are the better for it now.
The chainstay crimps are from an Esge kickstand no doubt and not factory, for bikes that were expected to receive a kickstand or side stand, Bertin brazed in a formed plate below. The dents are not aesthetic, but I really doubt they will cause a problem beyond that.
This bike was probably built for 700c wheels but of generous clearances, Mafac center pull brakes suggested.
+1 to what repechage said. You will probably find Mafac Racers, or Competitions would be a good fit for brakes. Check the brake drop with some 700C wheels as Racers were frequently OEM on the mid-priced Bertins and remain outstanding stoppers with a good set of Kool Stop inserts. New decals are readily available from VeloCals if a repaint is in the future. Don't worry about the tubing seam as they can be difficult to see. Maybe try again with a flashlight looking down the tubes. And thanks for the kind words regarding the site.