New: the first Grand Seiko mechanical chronograph – Tentagraph.

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Grand Seiko introduces their first mechanical chronograph – the Tentagraph.

Press Release with commentary in italics.

New: the first Grand Seiko mechanical chronograph – Tentagraph.

The retail price of the new Grand Seiko Tentagraph in Europe: EUR 14,300 inclusive of EU taxes.


As a line extension to the Evolution 9 Collection, the new chronograph is an interesting addition to the Grand Seiko mechanical lineup. Up to now, the only chronograph at this level in the GS universe is the very capable Spring Drive Chronograph which we are very fond of. This is the first time that GS has released a mechanical chronograph. Earlier editions of their mechanical chronograph is the Caliber 9SA5 which was used only in Seiko watches.

The new Tentagraph Caliber 9SC5 is high beat (36,000 bph), and runs on two barrels. Seiko claims the three day power reserve is the highest for a chronograph in the market. This power reserve remains even when the chronograph is running.

The aesthetics are the typical Grand Seiko, with reference to the GS Code of Design and zaratsu finishing. The case is 43.2mm in titanium.

Release details

Last year, at Watches and Wonders Geneva, Grand Seiko introduced its first mechanical compli- cation and a series of sports watches from the Evolution 9 Collection. Today marks a new milestone as Grand Seiko expands its Evolution 9 sports watch offering with its first mechanical chronograph, the Tentagraph.

Just like every Grand Seiko creation, the pursuit of precision is at the heart of the new Tenta- graph, whose chronograph movement features the revolutionary high-beat Caliber 9SA5 as its base. 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, making the Tentagraph the 10-beat chronograph with the longest power reserve in the industry today.* Furthermore, the Tentagraph is subjected to a new and longer testing procedure. As with all Grand Seiko mechanical movements, the Tentagraph’s time-of-day accuracy is assessed in six positions and at three temperatures over 17 days but, in addition, there are three more days of testing during which the accuracy is assessed in three positions while the chronograph is in operation. Thus, in total, each Tentagraph movement is tested for 20 days to ensure that it meets the Grand Seiko Standard of +5 to -3 seconds per day.

With the new Tentagraph, Grand Seiko adds a new dimension to its range of sports watches and opens a new chapter in its history.

*As of March 2023. Based on Grand Seiko’s research.

The new movement features the revolutionary Dual Impulse Escapement, which efficiently transfers energy to the free-sprung balance wheel indirectly through the pallet fork and also directly from the escape wheel. MEMS technology ensures extremely precise, lightweight, and highly durable escapement parts and also endows the escapement with increased energy efficiency to achieve a long power reserve.

Hallmarks of a high-quality modern chronograph, a vertical clutch and a column wheel ensure high accuracy and operability. The vertical clutch eliminates any shuddering or jumping of the hands when the chronograph is engaged and enhances measurement accuracy, while the column wheel delivers precise control of the chronograph operation. The movement incorporates a three-pointed hammer, which ensures that, when the reset pusher is pressed, the hands return to zero instantly and in perfect synchronization.

An Evolution 9 sports watch true to the ideals of Grand Seiko

The ideals of a Grand Seiko sports watch are readily apparent in this new chronograph. The powerful hands and prominent, grooved indexes of the Evolution 9 Style ensure supreme legibil- ity. 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 of the time of day.The case and bracelet are made of high-intensity titanium, which is about 30% lighter and more scratch resistant than stainless steel to maximize durability, and the two convex pushers ensure the operability required for measuring elapsed time at the highest level.

The dial features Grand Seiko’s signature “Mt. Iwate pattern,” which takes inspiration from the ridged contours of the nearby mountain visible through the windows of the Grand Seiko Studio Shizukuishi, where the Tentagraph and all other Grand Seiko mechanical watches are hand-assembled and adjusted. The Mt. Iwate dial first appeared in 2006, and the pattern has since become deeply associated with Grand Seiko mechanical watchmaking. The majestic peak serves as an enduring inspiration for Grand Seiko, and its choice for the brand’s first mechanical chrono- graph is both symbolic and fitting. Combined with the gentle blue hue, the dial takes the imagina- tion upwards towards the night sky above Mt. Iwate.

The Grand Seiko Tentagraph joins the Evolution 9 Collection and will be available at the Grand Seiko Boutiques and select retail partners starting in June 2023.

Grand Seiko Evolution 9 Collection Tentagraph: SLGC001

Caliber 9SC5
Driving system: 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 and bracelet
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
Diameter: 43.2mm, Thickness: 15.3mm
Three-fold clasp with push button release



  1. Cuentatiempos on

    A Made in Japan like a temple. Surely offering more than Rolex. The crown, very calm, maintains its distinction based on not offering a profusion of references from the economic segment that motivate the phrase “All Seikos look alike”. Each of the Rolex models is distinguishable a mile away from its other collections.

  2. Pingback: New: the first Grand Seiko mechanical chronograph – Tentagraph. –

    • My eyes popped out of my head at the price until I saw in other articles that you’re out by €10k.
      My eyes have been replaced and so has my wallet.