No longer is Jaeger Lecoultre Master piece for sophisticated-looking middle-aged men; this classic timepiece will fit the young executive perfectly due to the 39-mm case diameter and fresh yet refined-looking dial.With Jaeger LeCoultre Master Ultra Thin Moon 39 watch. The mechanical movements of Jaeger LeCoultre are well respected amongst watchmakers and consumers, and with this calibre 925 mechanical movement, you can be proud of the craftsmanship. Only 4.9 mm in height, it is considered to be an ultrathin movement with complicated functionality.