Abstract: A watch mechanism incorporating two barrels each containing a spring. The springs contained in each barrel are positively connected in series to each other via a gear mechanism or a common arbor.The considerable energy available makes it possible to maintain the movement of a high frequency spring balance oscillator. The barrel rotates rapidly to drive the first pinion of the train of gears with an angular velocity approximately double relative to the normal angular velocities; the torque is approximately half (600 gr.mm) that of conventional-sized watch mechanism of comparable performance.The barrels may be mounted coaxially or in the same plane and the mechanism can be arranged to be wound manually or automatically.