Hairspring 1: ETA Chron System
Join AWCI in the new series on hairsprings. An in-depth discussion of what makes the ETA Chron System unique and user friendly. Free for AWCI members $15 for general […]
American Watchmakers - Clockmakers Institute
Supporting and Advancing Horology through Education and Cooperation
Join AWCI in the new series on hairsprings. An in-depth discussion of what makes the ETA Chron System unique and user friendly. Free for AWCI members $15 for general […]