September 12, 2025
The Grand Seiko Tentagraph SLGC006 represents a material evolution of the brand’s first fully mechanical chronograph series. While its aesthetic is distinct, the underlying engineering principles remain the primary focus. This model is built upon the robust foundation of the Caliber 9SC5 movement and the established Evolution 9 case architecture, now executed with a specific combination of advanced materials.
Case Architecture and Dimensions
The SLGC006 adheres to the established dimensions of the Tentagraph line. The case, crafted from High-Intensity Titanium, measures 43.2mm in diameter and 15.3mm in thickness, with a lug-to-lug profile of 51.5mm. These dimensions house a complex movement while aiming for ergonomic balance. A box-shaped sapphire crystal protects the dial, and a screw-down crown helps secure its 100-meter water resistance rating. The caseback is fitted with a display crystal, allowing for direct observation of the movement’s mechanics.
Engineering Details: Caliber 9SC5
At the heart of the Tentagraph is the Caliber 9SC5, a high-frequency automatic chronograph movement. Its designation derives from its key specification: a balance that oscillates at ten beats per second, or 36,000 vibrations per hour (5 Hz). This high rate allows for more precise timekeeping and chronograph measurements. Despite the high energy consumption typical of 5 Hz movements, the Caliber 9SC5 achieves an impressive 72-hour power reserve through the use of twin barrels and a high-efficiency dual-impulse escapement. The chronograph function is actuated by a column wheel for precise control and features a vertical clutch to ensure smooth engagement without the common ‘jump’ of the chronograph seconds hand. The movement is adjusted to a standard of -3 to +5 seconds per day.
Advanced Material Composition
The SLGC006 distinguishes itself through its specific material selection. The primary case and bracelet are constructed from High-Intensity Titanium, a proprietary alloy known for its light weight and high scratch resistance compared to stainless steel. This is strategically paired with 18k rose gold for key interface points: the bezel ring, crown, and chronograph pushers. The bezel itself contains a black ceramic insert with an engraved tachymeter scale, chosen for its extreme hardness and resistance to fading. This multi-material approach combines the durability of titanium and ceramic with the refined touchpoints of precious metal.
In conclusion, the Tentagraph SLGC006 is a study in precision engineering and material science. Its value is anchored in the technical superiority of the Caliber 9SC5 and the functional integration of titanium, ceramic, and gold, showcasing Grand Seiko’s commitment to high-performance mechanical watchmaking.
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