ref.5204
The case, in platinum, measures 40mm. It has a sapphire crystal, a sapphire and solid display back, and is water resistant to 30 meters.
Movement is the Swiss hand-wind Patek in-house caliber CHR29-535 PSQ with hours, minutes, seconds, perpetual calendar (day, date, month, leap year), day/night indication, moon phases and split-seconds chronograph.