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http://www.thewatchbox.com Jaeger-LeCoultre's Reverso only gets better with time. After parts of nine decades on the market, JLC's iconic watch continues to cut the same "golden ratio" art deco profile while adding new tricks. The bigger, bolder, and mechanically refined Reverso Grande Reserve packs a unique in-house eight day power reserve into a case designed to suit modern century tastes. Its 48mm "XGT" case pulls the once-38mm Reverso out the early 20th century and into the 21st. The Grande Reserve preserves the classic proportions of the traditional Reverso while increasing the absolute dimensions to thrive in a world dominated by 40mm+ Patek Philippes and 43mm Vacheron Constantins. Jaeger-LeCoultre is known for its Reverso, but the Le Sentier watchmaker also is famed for its superb engineering chops. JLC created a revolutionary eight-day movement for the 2002 "Septantieme," the limited-edition 70th anniversary Reverso. That movement proved so challenging to design and package that the "70eme" didn't debut until a year after the 2001 Reverso anniversary celebration. But the wait was worth it. JLC's Cal. 879 in the Septantieme became the Caliber 874 in the Grande Reserve. From the dual mainspring barrels in series to the superb metering of force throughout the eight-day run, the most significant elements of the $94,000,000 70eme movement are employed in the Reverso Grande Reserve. When the Grande Reserve debuted in 2003, it featured the proverbial Ferrari engineering at Mustang prices. Fun fact: while the movement is rated for accurate operation over eight days, owner experience has proved the watch capable of nearly ten days of continuous function on a single full wind. On a watch named "Reverso Grande Reserve," one would expect the power reserve gauge to receive prominent placement, and it does. JLC employs an original invention - a jumping reserve indicator - to indicate the remaining days of power reserve. Jaeger-LeCoultre leverages the second side of the Reverso's revolving case to place the power reserve window in a place of honor. The entire case back is dedicated to the window housing the indicator, and the mechanism will jump in both directions as the watch is wound and discharged. The bigger, more refined, and more modern XGT Reversos helped to start the phenomenal run that JLC's classic model has enjoyed for the last decade-plus. Arguably more loved and more hip than it has ever been, the Reverso of today is basking in the warmest public embrace since its 1931 debut. Larger models like the Reverso Grande Reserve, available from thewatchbox.com, are the reason for the icon's contemporary resurgence. Video and content by Tim Mosso.