The movement ( 1 ) of the watch includes a constant force device ( 14 ) inserted in a going rain connecting a spring barrel ( 2 ) to an escapement having an escapement wheel and including a third wheel which completes one revolution in several minutes. The input element of the constant force device ( 14 ) is the third wheel ( 12 ), the output element of said device ( 14 ) being a second third wheel ( 20 ) connected via gearing to the seconds pinion ( 38 ). The second third wheel is secured to a star wheel ( 26 ) that only releases the train upstream of the constant force device once per minute, thus forming an independent minutes display because the minute hand ( 7 ) jumps forward at each minute. This arrangement minimises the transmission of shocks between the constant force device and the escapement and can advantageously be combined with a tourbillon ( 40 ).