Chronometer; wrist-chronometer with frequency of oscillating system ≤ 1000 Hz; designation, requirements, testing Chronometers; bracelet chronometers with oscillator frequency ≤ 1000 Hz; designation, requirements, essays in connection with the of the
DIN 8319-1:1980 history
1970DIN 8319-1 E:2010-09 Chronometer; wrist-chronometer with frequency of oscillating system 1000 Hz, designation, requirements, testing