The Portugieser Perpetual Calendar (ref. IW503406) from IWC Schaffhausen is the first watch in the current Portugieser Collection to have a perpetual calendar and a platinum case.
The gleaming white grey platinum case perfectly matches the silver-plated dial, as well as the rhodium-plated hands and appliques.
The case houses the IWC 52615 manufacture calibre. The Pellaton winding is fitted with ceramic components that are practically wear-free, and builds up a power reserve of seven days with its oscillating weight made from solid 18 carat red gold. The highly embellished movement is visible through a see-through sapphire glass back.
The main feature on the dial of this watch is the perpetual calendar. Developed by Kurt Klaus in the 1980s, the mechanism consists of around 80 parts and displays the date, day, month and moon phase, as well as the year in four digits. It can be easily adjusted using the crown.
The mechanism identifies different month lengths and leap years automatically and will work until 2100 without needing any correction. This version of the calendar comes with a double moon display that gives an inverted view of the moon phases for both the northern and southern hemispheres. Thanks to a special reduction gear, the display is so accurate that it will only deviate from the actual orbit of the earth’s satellite after 577.5 years, and then only by one day.
Power reserve display
Perpetual calendar with date, day and month display, four-digit year display and perpetual moon phase for both northern and southern hemispheres
Small hacking seconds
IWC manufacture calibre 52615 Mechanical movement
Pellaton automatic winding
Frequency: 28,800 vph / 4 Hz
Power reserve: 7 days (168 h)
18 carat gold oscillating weight
Case, dial and strap
Diameter: 44.2 mm
Height: 14.9 mm
Crystal: Sapphire, domed, anti-reflective coating on both sides
See-through sapphire glass back
Water resistance: 3 bar
Silver-plated dial, rhodium-plated hands and appliques
Black alligator strap