THERE ARE TWO TYPES OF -SONNERIE-GRAND OR PETITE-WHICH ARE EN PASSANT ,WHICH THEY STRIKE 2 GONGS AT WILL AND NOT AS A MINUTE REPEATER
ON DEMAND.THE SONNERIE PLAQUE WOULD NEED TO BE PRESENT TO AN OBSERVER TO SHOW THAT IT IS A QUALITY ABOVE A MINUTE REPEATER
IF THE WATCH WAS NOT RUNNING.THE PRICE FOR A MINUTE REPEATER AS PER THE VACHERON CONSTANTIN IS ABOUT 300K+ FOR A SONNERIE IT WOULD BE A COUPLE OF MILLION OR MORE.
THE POWER FOR THE SONNERIE IS TAKEN FROM THE MAINSPRING (UNLIKE A MINUTE REPEATER) HAVING AN AUTOMATIC MOVEMENT WOULD MAKE IT EASIER
TO RUN AS LONG AS THE WATCH IS WORN ON THE WRIST OR ON A WATCH WINDER
THE PLAQUE AS IN THE MASTER MINUTE REPEATER IS LOCATED WHERE THE GONGS UTILISES THE CRYSTAL FOR ITS SOUND ON 2 GONGS AND UNIQUE TO JLC