Watch Marketing And Maintenance

What makes a mechanical watch tick with precision? This in-depth guide explores the eight fundamental forces that affect timekeeping accuracy — and the engineering solutions that have driven watchmaking forward for centuries.

Jaeger-LeCoultre's 1,000-Hour Control is one of the most rigorous watch quality standards in the industry — stricter than COSC chronometer certification. Learn how it works and why it matters.

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.