This post is dedicated to all watchlifestylers that like classic brands and timepieces that are elegant and timeless. The Jaeger-LeCoultre Master Ultra Thin Réserve de Marche ref. 1378420 is a watch that you can wear in any setting and that is perfectly suited for the most demanding occasions. This watch, with its power-reserve register and pointer-type date display, is as elegant as it gets and a classic timepiece that you won't have a problem wearing with jeans or a bespoke suit.