Old world inspiration meets new world technology in this sporty retrograde perpetual calendar with alarm unlike any other. This stainless steel black ion plated watch with carbon fiber dial ring features dual time, month-day-date, 12/24 hour time, non-reflective crystal, 42mm screw-back case, 100M WR & foldover clasp with hidden double push button. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E870.