A watch is formed by a mechanical movement incorporating a mechanical resonator. The watch comprises a display displaying the time and a correction device for correcting the displayed time, which is formed by a receiver for receiving an external correction signal which is supplied by an external electronic device (in particular a mobile phone), a braking device for braking the mechanical resonator and an electronic controller. The correction device is arranged such that it can correct the time displayed as a function of a time error (loss or gain) contained in the external correction signal. For this purpose, the correction device is arranged such that the braking device can act on the mechanical resonator during a correction period to vary the running of the drive mechanism of the display, in order to correct at least for the most part the time error in the time displayed.