Wednesday Hump Day Fun Fact # 49 !!!
Posted by Daubin Barshtak on May 28, 2014.
(Jaeger-LeCoultre Master Reserve de Marche - Q1488104)
Power Reserve Indicator (originally called Réserve de Marche) is a wristwatch complication designed to show the amount of remaining stored energy. The power reserve indicator indicates the tension on the mainspring at any particular moment. Power reserve indicators were employed very early on in marine chronometers and later in the accurate Railroad grade pocket watches. In 1933, Breguet created the first wristwatch with the power reserve mechanism. However, this was only a prototype with only one watch assembled. In 1948, Jaeger-LeCoultre introduced a power reserve indicator designed for production in a series of watches called the Powermatic, which utilized the LeCoultre Caliber 481. Thus, Jaeger-LeCoultre was ostensibly the first watchmaking company to launch wristwatches with a power reserve indicator to the masses.