Zenith ElPrimero Grande Class Open Power Reserve Ref: 03.0520.4021, 44MM Stainless Steel case. Black Dial with open chronograph, fixed stainless steel bezel, silver-tone hands and alternating hour index and Arabic numeral, minute markers around the outer rim hour markers, Minute markers around the outer rim., Four sub-dials displaying: 30 minute counter at the 3 o'clock position, power reserve indicator at the 6 o'clock position, opened dial at 10 o'clock showing the heart of el primero movement, small second hand at 9 o'clock. Zenith Calibre El Primero 4021H Automatic movement, Excellent condition with box and papers