Watch Marketing And Maintenance » quartz watch

No international standard exists yet for quartz chronometers, but COSC has developed rigorous testing based on ISO 3159. Learn how quartz chronometers are tested, certified, and why they are 10× more accurate than standard quartz watches.

A comprehensive guide to essential watchmaking technical knowledge — gear transmission ratios, electrical units, magnetism, electromagnetics, tolerances and fits, geometric tolerances, and heat treatment.

A comprehensive guide to watch classification by power source — covering mechanical watches and the four generations of electronic watches, from the 1957 Hamilton Ventura to the Tissot T-Touch hybrid.