This is a beautiful Cortébert Jubilé Date automatic vintage watch from the 60’s. Réf. 298.003, caseback engraved « 1er Grand Prix Observations » with a Cal. 298 Cortébert automatic (based on ETA 2522).
The specifications of the Cal. 298 Cortébert (based on ETA 2522); here.
If you want to read more about the history of Cortébert; here.