Grand Seiko Tentagraph Reference SLGC001

Grand Seiko presents Tentagraph (reference SLGC001), the first mechanical chronograph from the Japanese premium watch brand. This timepiece houses the high-beat Caliber 9SC5 with three days of power reserve. This new model from the Evolution 9 collection has a gentle blue color dial with a beautiful texture inspired by the Mt. Iwate.

Grand Seiko Tentagraph Reference SLGC001

In 2022, Grand Seiko introduced its first mechanical complication and a series of Spring Drive sports watches from the Evolution 9 Collection. The brand is now expanding the GS Evolution 9 series with its first mechanical chronograph, the Tentagraph. Its calibre is based on the revolutionary high-beat Caliber 9SA5.

Grand Seiko Tentagraph Caliber 9SC5

Like Caliber 9SA5, the new Tentagraph Caliber 9SC5 beats ten times per second, ensuring high accuracy when measuring elapsed time as well as the time of day. And, thanks to its energy-efficient escapement and two barrels, the watch runs for three days even when the chronograph is in operation.

Caliber 9SC5 Automatic

Visible through the exhibition case back, the Grand Seiko Caliber 9SC5 movement features the revolutionary Dual Impulse Escapement. This component efficiently transfers energy to the free-sprung balance wheel indirectly through the pallet fork and also directly from the escape wheel.

The brand uses MEMS technology to manufacture extremely precise, lightweight, and highly durable escapement parts. It endows the escapement with increased energy efficiency to achieve a long power reserve.

Grand Seiko Tentagraph Reference SLGC001

This modern chronograph movement with a vertical clutch and a column wheel offers high accuracy and operability.

Grand Seiko Tentagraph SLGC001

A genuine mechanical sports chronograph, the Grand Seiko Tentagraph SLGC001 comes with high-intensity titanium case and titanium. Measuring 43.2mm in diameter, the case with a curved profile features wide lugs for accommodating a 23mm bracelet. It also fuses the Zaratsu polished, distortion-free mirror finished surfaces with delicate hairline finished ones.

It also hosts two convex pushers (at 2H and 4H) for operating chronograph function. The ceramic bezel protects the watch from scratches and enhances durability.

The GS SLGC001 has a Mt. Iwate pattern dial with prominent indexes and recessed sub-dials, adding substantial depth and legibility to the design. First introduced in 2006, this distinctive dial pattern evokes the ridged contours of the nearby mountain visible through the windows of the Grand Seiko Studio Shizukuishi.

The bold hands and large grooved indexes with Lumibrite further enhance night time legibility. The dial hosts a running seconds sub-dial at 3H, a 30-minute chronograph counter at 9H, and a 12-hour chronograph counter at 6H.

The chronograph seconds hand is gently curved down towards the dial so that the tip of the hand is as close as possible to the dial’s markers and extends to the markings at the very edge of the dial. The minute hand is also gently curved to ensure the legibility.

Grand Seiko Tentagraph Reference SLGC001

The Tentagraph will be available at the Grand Seiko Boutiques and select retail partners starting in June 2023.

Technical details

Model: Grand Seiko Tentagraph, Reference SLGC001/ SLGC001G

Collection: Grand Seiko Evolution 9

Caliber 9SC5 Automatic
Frequency: 36,000 vibrations per hour (10 beats per second)
Accuracy (mean daily rate): +5 to -3 seconds per day
Power reserve: 72 hours
Chronograph with 30-minute counter at 9 o’clock and 12-hour counter at 6 o’clock
Number of jewels: 60
Diameter: 33.0mm, Thickness: 8.0mm

High-intensity titanium case
Diameter: 43.2mm
Thickness: 15.3mm
Box-shaped sapphire crystal with anti-reflective coating
See-through screw case back
Screw-down crown
Water resistance: 10 bar
Magnetic resistance: 4,800 A/m

High-intensity titanium bracelet
Three-fold clasp with push button release

Recommended retail price
€14,300/ ¥1,815,000/ $13,700