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Watchuwant is now WatchBox! Subscribe for the best luxury watch content. The Jaeger-LeCoultre Master Grande Taille is a pioneer and a landmark in modern luxury watchmaking. In 1992, Jaeger-LeCoultre launched the Master 1000 Hour Control testing regimen. Its six-week battery of practical trials was revolutionary; no competing high-horology brand offered anything comparable to this grueling evaluation, and COSC's chronometer test looked downright silly by comparison. And this Master Grande Taille was the first Jaeger-LeCoutlre to run the gauntlet. 37mm in diameter, cased in stainless steel, and graced with a silver dial, the traditionally-wrought Master Grande Taille offers little outward clues as to the revolution within. Dauphine hour and minute hands trace an arc across applied arrow indexes and Arabic numerals; a heat-blued seconds hand provides a note of contrast, and the soleil finish completes the picture of mid-century refinement. But invert the watch, and behold the Master Grande Taille's badge of honor. Individually numbered, each 18-karat red gold Master 1000 Control medallion represents the seal of approval bestowed by the Jaeger-LeCoultre watchmaker who certified that unit's triumph against the 1000 Hours Control. Substance rules all, so specifics are necessary to unpack the significance of the 1000 Hours Control. For comparison, the COSC Swiss Chronometer evaluation specifies two weeks of testing in five positions, and at three temperatures. The COSC test applies only to uncased movements. Given the changes that can occur between testing and final casing, the COSC certificate often amounts to a defunct relic before a "chronometer" even reaches the end user. Jaeger-LeCoultre's Master 1000 Hours Control tests only fully-cased watches. Each Master Grande Taille has survived six weeks of shock tests, magnetic exposure, full power reserve endurance tests, exposure to extreme heat and cold, manual winding tests, automatic winding tests, water resistance tests, and tests for variation in all six cardinal positions. In other words, the Jaeger-LeCoultre standard set the standard for the industry. While other watchmakers now claim to undertake in-house testing regimens, only JLC was the first to recognize the need to substantiate claims of precision, endurance, and robustness. In a similar vein, since 2003, all Jaeger-LeCoultre watches save the micro-caliber 101 have been subjected to the Master 1000 Control process, but only the Master Grande Taille can claim to have been first. See this landmark watch, the Jaeger-LeCoultre Master Grande Taille, in high-resolution images on our website: https://www.thewatchbox.com/watches/jaeger-lecoultre Instagram: https://www.instagram.com/watchbox/ WatchBox Reviews Channel: https://www.youtube.com/WatchBoxReviews Video and content by Tim Mosso.