A paragon of visual balance and legibility, the perpetual calendar model bearing Reference 5320 was designed in 2017 in a white gold case with a cream-lacquered dial. Its vintage style is reinterpreted in a new white gold version fitted with a gilded opaline rose gold dial. The calendar displays are arranged in the characteristic manner of Patek Philippe perpetual calendar watches since 1941, with a twin in-line day/month aperture at 12 o’clock and a date indicated by a hand surrounding a moon-phase aperture at 6 o’clock. These are complemented by two round apertures: one for the day/night indication between 7 and 8 o’clock; and the other for the leap-year cycle between 4 and 5 o’clock E28094 both of which are useful to adjust the calendar. The extremely accurate moon phases require a one-day correction only once every 122 years.

Watch

• Self-winding mechanical movement
• Caliber 26‑330 S Q
• Perpetual calendar
• Day, month, leap year and day/night indication in apertures
• Date by hand
• Moon phases
• Sweep seconds

Dial

• Rose-gilt opaline, charcoal gray gold applied numerals with luminescent coating

Case

• White gold
• Diameter : 40 mm
• Height : 11,13 mm
• Water-resistant to 30 m
• Interchangeable solid and sapphire crystal case backs

Strap

• Alligator leather with square scales, hand-stitched, shiny chocolate brown
• Fold-over clasp