Gold Souk, Deira
Grand Seiko Tentagraph, reference SLGC007

Grand Seiko

Tentagraph

Ref. SLGC007

On request

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Case43.2mm brilliant hard titanium
DialBlue-black Mt. Iwate pattern
MovementHi-beat chronograph 9SC5
BraceletTitanium
ConditionSourced current model

Tentagraph stands for TEN beats per second, Three days, Automatic chronograph: Grand Seiko's first mechanical chronograph, and they aimed it straight at the Swiss sports elite. Mt. Iwate dial, brilliant hard titanium, hi-beat 9SC5 inside.

Grand Seiko's Tentagraph, reference SLGC007, 43.2mm in Brilliant Hard Titanium with the 10 beat calibre 9SC5.

The reference in depth

Grand Seiko's own hi-beat chronograph, finally

Why this one matters

Grand Seiko spent decades without a mechanical chronograph of its own. The chronographs in the catalogue were Spring Drive, running on the 9R8 family, principally the 9R86 and the higher grade 9R96, and anyone who wanted gears and a column wheel had to look elsewhere. That changed in 2023 with the Tentagraph and calibre 9SC5, developed at the Shizukuishi studio in Iwate, where all Grand Seiko mechanical movements are made.

The name is an assembly of the specification: ten beats a second, three days of reserve, automatic, chronograph. The case follows Evolution 9 lines rather than the 1967 grammar, with wide flat lugs and a lower centre of gravity. The dial pattern refers to Mount Iwate, which is what the studio looks out at. SLGC007 arrived in 2025 as the second regular production Tentagraph, after SLGC001.

The movement

9SC5 is a fully mechanical integrated automatic chronograph: column wheel, vertical clutch and a balance running at 36,000 vph. Grand Seiko rates it at plus 5 to minus 3 seconds a day as a mean, and plus 8 to minus 1 in normal use, with 72 hours of reserve that the brand states holds with the chronograph running. The vertical clutch means the chronograph seconds hand starts without the small jump a lateral clutch gives.

On the wrist

There is no hiding it: 43.2mm across and 15.3mm thick. High-intensity titanium removes enough weight that the size registers visually rather than physically, and the Evolution 9 lugs are short and flat, at 51.5mm from tip to tip, so it sits down better than the diameter suggests. On a wrist under about 17cm it is a lot of watch.

Questions we are asked about this reference

Is the Tentagraph a Spring Drive?

No. It is fully mechanical at 36,000 vph, with no quartz reference of any kind. The Spring Drive chronographs run on the 9R8 family, principally the 9R86 and the higher grade 9R96, in a different set of references, and the two run and sound quite different.

Does a hi-beat need more servicing?

It asks more of its lubricants than a 4Hz movement, so keep to the interval rather than stretching it. Work of this kind goes back through the brand's own network, so budget time as well as money.

Is 43.2mm the real size on the wrist?

Close to it. The diameter is honest and the 15.3mm thickness is genuine, but the short flat lugs and 51.5mm lug to lug keep the overhang in check. Try it before deciding on the number alone.

The collection

Evolution 9

The newer case language, and where most recent mechanical calibres appear first

Evolution 9 is Grand Seiko's modern design language, introduced in 2020 on the 60th anniversary hi-beat SLGH002 and established as a catalogue line in 2021 with the White Birch SLGH005. It reworks the 1967 house grammar with wider, shorter lugs, a lower centre of gravity and broader hands and markers for legibility. It is also the first home for most of the recent mechanical calibres, the hi-beat 9SA5, the 9SC5 chronograph and the hand wound 9SA4.

Sizes in the family

roughly 37mm to 44mm by model, divers and chronograph largest

Who it suits

For a buyer who wants the newer case language rather than the classic 44GS styling, with a current generation movement inside.

See every Evolution 9 we have

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