Zenith Pilot Montre d'Aeronef Type 20 Annual Calendar 48MM Stainless Steel Chronograph Black Dial Dark Brown Alligator Strap 03.2430.4054-21.C721 8RD76P Polished finished stainless steel case. Matte black dial with Arabic numerals painted with SuperLuminova. Brushed ruthenium hands with SuperLuminova fill. White printed minute/seconds/fractions of a second track around the dial. Chronograph functions: 60-minute counter at the 6 o'clock position. Small seconds counter at the 9 o'clock position. Day and month windows at the 3 o'clock position. Date window at the 6 o'clock position. Zenith El Primero Caliber 4054 automatic movement, 36,000 vph. contains 29 jewels, is comprised of 341 components and has an approximate power reserve of 50 hours. Case back engraved with Zenith aviation instruments.