September 12, 2025
Grand Seiko just dropped a new limited edition, and it’s an absolute stunner. But beyond the gorgeous ‘copper pink’ dial, the new Tentagraph SLGC006 is packed with some seriously cool details you might have missed. Here are five things you probably didn’t know about this incredible watch.
1. It’s Part of a Historic First for the Brand
While Seiko has made chronographs for decades, the Tentagraph series is a huge deal because it was Grand Seiko’s first-ever fully mechanical chronograph. The brand launched Spring Drive chronographs before, but this was their first pure mechanical, making the SLGC006 a descendant of a true milestone watch for collectors.
2. The Name “Tentagraph” Is Basically a Secret Code
The name isn’t just a cool-sounding marketing term. It’s actually a clever summary of the movement’s specs. It comes from the fact that the caliber beats at TEN beats per second, has a Three-day power reserve, and is an Automatic chronoGRAPH. Once you see it, you can’t unsee it.
3. That Dial is Inspired by a Volcano at Sunrise
Grand Seiko is famous for nature-inspired dials, and this one has a very specific story. The metallic “copper pink” color and intricate texture are meant to evoke the ridges of Mt. Iwate—an active volcano near their studio—as it’s bathed in the light of the morning sun. It’s a work of art you can wear on your wrist.
4. It’s Made of “High-Intensity” Titanium
The case isn’t just regular titanium. Grand Seiko uses its proprietary “High-Intensity Titanium” alloy, which is both lighter and more scratch-resistant than stainless steel. The watch gets its warm, two-tone look from the strategic use of 18k rose gold for the bezel, crown, and pushers, creating a beautiful contrast.
5. Its Engine Beats Faster Than Most
Inside the SLGC006 is the Hi-Beat Caliber 9SC5, a high-performance engine running at 36,000 vibrations per hour. This rapid beat rate allows for more precise time measurement and gives the chronograph hand an incredibly smooth sweep. What’s even more impressive is that it achieves this while maintaining a massive 72-hour power reserve.
With only 300 of these being made worldwide, the SLGC006 is more than just a beautiful watch; it’s a limited-edition piece of Grand Seiko history. This blend of high-tech mechanics and artistic inspiration is what makes the brand a true fan favorite.
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