Caliber: El Primero https://v.gd/lnRkQO link 400Functions: Hours and minutes from the center. Small https://tinyurl.com/33uzcka9 link seconds at nine o'clock. Chronograph: central https://v.gd/0cWfrw link chronograph hand, 12-hour counter at six o'clock, 30-minute counter at three o'clock. Tachymetric scale. Date indication at 4:30. Diameter: 30mmPower Reserve: 50 hoursWinding: AutomaticFrequency: 36,000 vphJewels: 31