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https://www.youtube.com/watch?v=ZCRex8Tjcng

Caliber: link El Primero 400 AutomaticFunctions: Hours link and minutes in the center. Small seconds at nine o'clock. Chronograph: central chronograph hand, 12-hour counter at six o'clock, 30-minute counter at link three o'clock. Tachymetric scale. Date indication at 4:30.Power Reserve: 50 hoursWinding: Automatic Frequency: 5 HzChronometer Certified: No

In wristwatches one of the best-known chronometer-grade watches was the famous high-frequency Ultra-Chron which debuted in 1967 to celebrate the company's 100th anniversary birthdays then as now were a big deal for watch brands. The Ultra-Chron link watches used 36000 vph movements and came out at a time link when the competition link for accuracy in wristwatches was really fierce.