Broken pedal on an old french bike
To quote Sheldon:


  Older French bicycles used a different, smaller diameter where the
  pedal screws into the crank, 14 mm x 1.25 mm.
  
  The vast majority of French bicycles imported into the U.S. used
  standard 9/16" x 20 tpi crank threading, but if you find an older
  bicycle that was bought in France, you may run into this problem. The
  French-thread cranks can be tapped out to 9/16". This is much easier
  (and more worth the trouble) with aluminum cranks. Start the taps from
  the inside of the cranks,so any possible thread damage occurs where it
  doesn't matter. French pedals will often be marked "G" (Gauche=left)
  and "D" (Droite=right).