Jaeger-LeCoultre Master Ultra Thin Power Reserve

The Jaeger-LeCoultre Master Ultra Thin Power Reserve, reference Q1378420, uses a 39 mm steel case with a thickness of 9.9 mm. The case is rated to 50 metres and has a 21 mm lug width. A black alligator leather strap incorporates quick-release technology and a double folding clasp. Self-winding calibre 938 runs at 4 Hz, equivalent to 28800 vibrations per hour, and delivers a 43-hour power reserve. The calibre contains 273 components, 41 jewels and one barrel. A sunray-brushed silvered dial combines rhodium-plated hour-markers with the date and a power reserve display.