Portugieser Perpetual Calendar

18 ct 5N gold case, Automatic, self-winding, Diameter 44.2 mm, Black alligator leather strap by Santoni, Strap width 22.0 mm.

Case
18 ct 5N gold case
Diameter 44.2 mm
Height 14.9 mm
See-through sapphire glass back
Water resistance 3.0 bar

Movement
52615 Calibre
IWC-manufactured movement
Automatic, self-winding
168 hours Power Reserve
Frequency 28'800 VPH (4 Hz)
381 Components
54 Jewels

Features
Small hacking seconds
Pellaton automatic winding
Sapphire glass, arched-edge, antireflective coating on both sides
Power reserve display
Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase for the northern and southern hemisphere
7 days power reserve

Reference
IW503404