The power-reserve indicator testifies to the quantity of energy available. It is at its highest level when the mainspring is entirely wound, and gradually dwindles as the latter uncoils. The display can be provided by a hand moving over the arc of a circle (sector), a graduated linear segment, a colored window or by other means. | WatchesandWonders

Full power! The power reserve indicator shows the amount of energy currently stored in the watch, indicating when it’s time to wind it. #singlehand #watchfam #watchoftheday #historicaldesign #powerreserve | MeisterSinger