In the Portofino Hand-Wound Eight Days, the IWC Schaffhausen-made calibre 59210 will run precisely and reliably for a full 192 hours, or 8 days, before automatically stopping. Strictly speaking, this is 9 days, but the extra day in reserve ensures that the movement maintains the most constant driving torque possible and continues to run accurately. The owner will always be on the safe side if he winds the watch once a week. The remaining power can be read off on the power reserve indicator on the dial. Together with the small seconds and date display, it gives the dial a pleasant balance. The index-free balance has a frequency of 28,800 beats per hour and, together with the Breguet spring bent into shape in accordance with centuries-old watchmaking tradition, contributes to the watch’s extraordinary precision.
