This Patek Philippe Annual Calendar Chronograph is designed with a 40.5mm steel case and black dial. It features an annual calendar complication with day, date & month displayed in apertures across the top of the dial; chronograph with both the 60-minute and 12-hour counters combined in the 6 o'clock position as an elegant monocounter. It is finished with a sapphire-crystal back, and five-link stainless steel bracelet.