WatchUSeek Watch Forums banner

7750 power reserve

  1. Pilots' & Military watches
    I just bought a flieger with a Valjoux 7750 from 1996. When I run the chronograph the watch stops after three hours. Leaving the watch overnight (with the chronograph off) it is still running the next morning. Is this performance usual for a watch of this age? Can we increase the chronograph...