Grand Seiko – SPORT Collection Tokyo Lion Tentagraph Titanium SLGC009

 

Grand Seiko – SPORT Collection SLGC009 Tokyo Lion Tentagraph Titanium 2025

The Grand Seiko Tentagraph movement is introduced in the Tokyo Lion design, created for high performance in any sporting situation.

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In 2019, Grand Seiko created a new sports watch inspired by the lion, an enduring symbol from its earliest days in 1960. The new series brought a distinctive edge to Grand Seiko sports watches with its sharp angularity and bold case design.  Today marks a new milestone for Grand Seiko as it pioneers the Tokyo Lion sports watch into a new era with a powerful yet refined design and high performance courtesy of its first mechanical chronograph movement, the Tentagraph.

A powerful symbol of excellence and determination

The lion symbol reflected the aim of the original Grand Seiko team to create the very best timepiece they could in terms of accuracy, durability, and beauty. Inheriting the lion symbol, this watch was developed in the relentless pursuit to advance the essence of the Grand Seiko sports watch. 

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From its case design rich with symbolism to its refined rubber strap and textured dial, numerous aspects have evolved from previous lion-themed timepieces in pursuit of key sports watch values such as legibility, durability, comfort, and beauty.

A design that pursues the essence of a sports watch

This watch marks the first time that Grand Seiko’s Brilliant Hard Titanium has been adopted in the Sport Collection. The alloy is brighter than traditional titanium, causing the case’s hairline finished and Zaratsu-polished surfaces to appear even more radiant, enhancing the strong design. Brilliant Hard Titanium makes the watch not only light but also highly resistant to corrosion and scratches while commanding a surface hardness double that of standard stainless steel. 

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On the side, the pushers have been updated to improve the chronograph function’s ease of use. The powerful design of these buttons was created to achieve a satisfying feeling when engaging the chronograph. 

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The new creation also features a dial pattern that takes inspiration from the mane of the lion as it waves in the wind. At the 3, 6, and 9 o’clock positions, there are distinctive, three-dimensional sub-dials, which are inlaid onto the dial. Thanks to these three-dimensional sub-dials, the distance between the sub-dial markings and hands has been reduced, leading to enhanced legibility. 

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Resembling the sharp claws of a lion, the diamond-cut indexes of the main dial reflect light beautifully. Moreover, these indexes have been made taller and shaped to hold sufficient Lumibrite for improved readability in any light condition.

Designed for wearing comfort 

The newly developed rubber strap has a tensile strength of nearly 2.7 times the typical silicone strap used for Grand Seiko. It was created for this watch, and its brown color pairs perfectly with the patterned dial. Not only does the strap have an excellent texture, but the motif on the back was inspired by the lion’s paw, providing a playful design detail even if it is only visible to the wearer. Combined with the slightly curved case back, the new strap ensures comfort and stability on the wrist befitting a Grand Seiko sports watch.

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Just like every Grand Seiko creation, the pursuit of precision is at the heart of the Tentagraph movement. Caliber 9SC5 beats 10 times per second, ensuring a high level of accuracy when measuring elapsed time as well as the time of day. 

 

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And, thanks to its energy-efficient Dual Impulse Escapement and two barrels, the watch runs for three days even when the chronograph is in operation. Furthermore, each Tentagraph is tested for 20 days, three days longer than most Grand Seiko mechanical movements, to ensure that it meets the Grand Seiko Standard of +5 to -3 seconds per day even when the chronograph is running.

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Third was the introduction of the Grand Seiko Free-Sprung Balance and overcoil. This overcoil helps improve the concentricity of the shape of the hairspring during oscillation across positions. At the same time, the free-sprung balance ensures a more stable precision long-term and higher shock resistance than a watch using a regulator. It allows for adjustments of the rate via the meantime screws on the balance, but also the beat error can be adjusted thanks to a rotatable stud affixed to the end of the uniquely shaped overcoil, which was determined after 80,000 simulations and utilized the data of the varying shapes to allow for this adjustment never before possible in a free-sprung balance.

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Most importantly, in the introduction of the 9SA5, the new and innovative Dual-Impulse Escapement was introduced. This escapement was developed to improve the efficiency of energy delivery from the two barrels through the gear train and delivered to the balance wheel. Much like a conventional lever escapement, the Dual-Impulse Escapement indirectly delivers power to the balance via the sliding action of the escape wheel across the impulse plane of the pallet jewel through the pallet fork and to the impulse pin attached to the balance staff.

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However, more uniquely, the escapement also delivers energy directly to the balance, similar to a detent escapement, where the escape wheel propels the balance wheel via the teeth of the escape wheel, directly colliding with a jewel attached to the side of the balance roller, allowing for the direct delivery of energy. This new escapement provides an efficiency approximately 20% greater than that of the already highly efficient 9S85 calibre, which uses a lever escapement that is improved via components manufactured with MEMS.

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MEMS allows for parts with more intricate designs, which reduces weight, enhances friction resistance due to smoother surfaces, and even adds a lubricant retention step on each tooth to preserve lubricant over a longer course of time. Naturally, the MEMS manufacturing method is also applied to the Dual-Impulse Escapement of calibre 9SA5, and though their designs are dramatically different, all those same benefits are still applied.

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It is important to understand the details of the Calibre 9SA5 to understand how Grand Seiko could potentially introduce a mechanical chronograph. It could have been assumed many years ago that if Grand Seiko were to create this type of calibre, it would have to be Hi-Beat 36000 due to the high stability and precision attainable with this frequency. But the key breakthrough, possibly unknown at the time, would be the introduction of the new Dual-Impulse Escapement, allowing for an incredibly high energy transmission efficiency. 

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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.

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This new creation will be available at the Grand Seiko Boutiques starting in August 2025.

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TECHNICAL SPECIFICATIONS 

Model:   Grand Seiko Sport Collection Tokyo Lion Tentagraph

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Reference: SLGC009

Case
    Material: Brilliant Hard Titanium
    Diameter: 43mm
    Thickness: 15.60 mm
    Box-shaped sapphire crystal with anti-reflective coating on the inner surface
    Screw-down crown
    See-through case back
    Water-resistant to 200meters (20 bar)
    Magnetic resistance: 4,800 A/m
Dial
    Light brown dial 
    Diamond-cut indexes and hands coated with Lumibrite
Movement
    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
    Number of jewels: 60
 Features
   - Chronograph
   - Dual Impulse Escapement
   - Twin barrels
Functions/Indications
    Chronograph with 30-minute counter at 9 o’clock and 12-hour counter at 6 o’clock
Strap
    Rubber strap with High-Intensity Titanium three-fold clasp with push button release

🔴 Price: EUR 17'500 / USD 16,400.💰

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Press releases - 2025
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SEIKO WATCH CORPORATION
Mr­­ Noboru­­ Miyadera
2-8-10, Toranomon, Minato-ku,
Tokyo­­ 105-8467
Japan
Telephone+81 3 6739 2150
Telefax+81 3 6739 2071
seiko-pr@seiko-watch.co.jp
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