VACHERON CONSTANTIN CALENDAR Reference: 37150 / 000J - 4. serial number: 614604. Case in 18k yellow gold. Light grey dial, seconds at 6 o'clock, days, date, months, moon phases. Mechanical self-winding movement, No. 770566. Leather strap on yellow gold buckle, signed. Sapphire crystal. Circa 1993. Diameter: 36 mm. Gross weight: 58.9 g. Accompanied by its case and papers. An 18k gold wristwatch automatic movement, by Vacheron Constantin. Circa 1993.