![High-beat precision and three days of power reserve. Introducing the first Grand Seiko mechanical chronograph, the Tentagraph. | Grand Seiko High-beat precision and three days of power reserve. Introducing the first Grand Seiko mechanical chronograph, the Tentagraph. | Grand Seiko](https://www.grand-seiko.com/us-en/-/media/Images/GlobalEn/GrandSeiko/Home/news/20230327-1/Main_visual1_.jpg?mh=668&mw=1000&hash=5BDDDC6371C2343460E9714BE1F22E89)
High-beat precision and three days of power reserve. Introducing the first Grand Seiko mechanical chronograph, the Tentagraph. | Grand Seiko
![Hands-On Debut: Grand Seiko Unveils the Tentagraph, Its First Mechanical Chronograph | WatchTime - USA's No.1 Watch Magazine Hands-On Debut: Grand Seiko Unveils the Tentagraph, Its First Mechanical Chronograph | WatchTime - USA's No.1 Watch Magazine](https://www.watchtime.com/wp-content/uploads/2023/03/Grand-Seiko-Tentagraph-Chronograph-SLGC001-6.jpg)
Hands-On Debut: Grand Seiko Unveils the Tentagraph, Its First Mechanical Chronograph | WatchTime - USA's No.1 Watch Magazine
![Hands-On Debut: Grand Seiko Unveils the Tentagraph, Its First Mechanical Chronograph | WatchTime - USA's No.1 Watch Magazine Hands-On Debut: Grand Seiko Unveils the Tentagraph, Its First Mechanical Chronograph | WatchTime - USA's No.1 Watch Magazine](https://www.watchtime.com/wp-content/uploads/2023/03/Grand-Seiko-Tentagraph-Chronograph-SLGC001-2-1500x1500.jpg)