Grand Seiko Tentagraph SLGC001 Review, Specs & Price | Ultimate Watch
The Grand Seiko Tentagraph SLGC001 is the watch a lot of collectors waited two decades for: the brand's first fully in-house, fully mechanical chronograph. Grand Seiko built plenty of chronographs before this using Seiko spring drive and older automatic bases, but the Tentagraph, released in March 2023 as part of the Evolution 9 collection, is the first time the company designed a dedicated mechanical chronograph movement from a clean sheet. The name is an acronym for what the caliber does: TEN beats per second, Three-day power reserve, Automatic winding, and chronoGRAPH. We handle a lot of chronographs on 47th Street, and this one lands in an unusual spot. It is a 43.2mm high-intensity titanium sports chronograph that runs at 36,000 beats per hour, holds 72 hours of reserve, and carries a Mount Iwate blue dial finished to a standard most Swiss houses reserve for watches costing three times as much. At $13,700 retail, it is Grand Seiko planting a flag in a category the brand had never truly owned. If you own one or want one, we buy and sell them, and we can tell you exactly where the money sits.
Specifications
History
Iconic References
Buying Guide
Pricing & Market Data
Cultural Significance
Collector's Lore
The lore on the Tentagraph is really the lore of the wait. Grand Seiko enthusiasts had asked for a true in-house mechanical chronograph for years, watching the brand pour its best engineering into spring drive and hi-beat time-only watches while leaving the mechanical chronograph seat empty. When the 9SA5 arrived in 2020 with the Dual Impulse Escapement, collectors immediately started speculating that a chronograph version was coming, and the Tentagraph in 2023 confirmed it. The other running conversation is size: at 43.2mm and 15.3mm thick this is a big, tall watch, and the community splits between those who find it a genuine sports piece that wears its heft well in titanium and those who wanted a more restrained case. The Mount Iwate dial keeps the poetry Grand Seiko is known for, tying the watch to the Shizukuishi studio in the mountains of Iwate Prefecture where the brand's mechanical watches are made, so even a hi-beat sports chronograph carries the nature-dial DNA. For the people who care about horological substance over hype, the Tentagraph earned respect the day it launched, because column wheel plus vertical clutch plus free-sprung balance at 36,000 bph is a serious answer, not a marketing exercise.
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