When the Caliber 9S debuted in 1998, it ushered in a new era of Grand Seiko mechanical watchmaking. An entirely new movement, Caliber 9S was designed from scratch to deliver the high precision and excellent durability for which Grand Seiko was already renowned. It became the platform on which all Grand Seiko mechanical watches would be built, giving rise to a full series of movements with different functions, escapements, and complications.

These include the revolutionary Caliber 9SA5 with its Dual-Impulse Escapement and Grand Seiko’s first mechanical chronograph, the Tentagraph. And, of course, there have been GMT watches in a diverse range of styles, including several timepieces with Hi-Beat movements.

In honor of the 25th anniversary of Caliber 9S mechanical watchmaking, Grand Seiko unveils two new GMTs in its Sport and Elegance Collections, each drawing inspiration from the skies over Mt. Iwate in Iwate Prefecture, where all Grand Seiko mechanical watches are hand-assembled by skilled craftsmen and women.