SLGH005 | Grand Seiko

The 25th anniversary of the 9S mechanical calibers 25 years of innovation and evolution Chapter 13: The Dual Impulse Escapement. A true innovation. As the mainspring in a mechanical watch unwinds, its power is transmitted through the escapement to the balance, whose back-and-forth motion regulates the speed of the hands and so determines the accuracy of the watch. The basic design of the “club tooth” escapement used in most mechanical watches has remained largely unchanged over the years but sev

SBGK007 | グランドセイコー公式サイト

Inside Grand Seiko: The Evolution Of The Spring Drive Movement