Jaeger LeCoultre, Master, Model: Q1368420 automatic mechanical stainless steel 39MM • Movement: Jaeger-lecoultre's self-produced Cal.925 / 1 automatic mechanical movement, 32 jewels, 28,800 vibrations per hour, 43-hour power reserve, with a transparent back for observing the movement's finishing. • Appearance: 39mm stainless steel case diameter, 9.3mm thickness, 50-meter water resistance; Silver-gray radiating dial, moon phase and date display window at 6 o 'clock, blue steel central second hand, bar hour markers; The black fishskin strap is paired with a stainless steel double-folding clasp and a sapphire crystal. • Style positioning: Ultra-thin dress watch, with an elegant and understated design. The moon phase function combines practicality and decoration, suitable for the vast majority of scenarios such as business commutes and formal occasions.