Caliber: El Primero 9004 automatic with Ultraviolet finishingFunctions: Hours, minutes, small seconds, 1/100 https://www.xorologi.it.com/Collezione/montblanc/ second chronograph with chronograph power-reserve display at 12 o'clock, central chronograph hand, 30-minute counter at three o'clock, 60-second counter at six o'clockPower Reserve: Approximately 50 hoursWinding: AutomaticFrequency: 36,000 vph (5 Hz) for watch; 360,000 vph (50 Hz) for chronographJewels: 53Chronometer https://www.xzegarki.pl/ Certified: https://www.modexx.co.uk/product-category/iwc/ Yes, by TIME LAB