IWC Schaffhausen Ingenieur Perpetual Calendar Digital Date-Month

The IWC Ingenieur Perpetual Calendar Digital Date-Month, reference IW381701, is a chronograph with a 45 mm case in 18-carat 5N gold. This watch is a limited edition of 100 pieces with a perpetual calendar. The 17.3 mm thick case has a screw-down crown. Self-winding calibre 89801 has a 68-hour power reserve and 51 jewels. Behind convex sapphire glass, the black dial has a large double-digit date display, small hacking seconds and a flyback function. The watch is on a black alligator leather strap. The case carries a water-resistance rating of 120 metres. The calibre has an operating frequency of 28,800 vibrations per hour.