IWCさんのインスタグラム動画 - (IWCInstagram)「Developed by Kurt Klaus in the 1980s the perpetual calendar module is mechanically programmed to recognize the different month lengths and the leap years. The patented double moon phase display shows the moon as seen from the northern and southern hemispheres and thanks to a special reductionist gear train, it is so precise that it will only deviate by one day after 577.5 years. The calendar module is driven via a single nightly switching impulse by the IWC-manufactured 52615 caliber movement with a power reserve of 7 days. #IWCpilot | #IWCtopgun | #IWClaketahoe 🔗Link in bio ℹ Black dial Ceramic case, 46.5mm IWC-manufactured 52615 Calibre See-through sapphire glass back Ref. IW503008」10月25日 22時22分