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Grand Seiko Evolution 9 'Ushio - 'Tide' Spring Drive
Ref. SLGA015G
The Evolution 9 collection arrived as Grand Seiko's declaration that the next generation of its design language would be drawn from the natural forces shaping Japan itself. This particular model takes the Kuroshio — the Pacific current that runs north along the archipelago, darker and warmer than the surrounding ocean — as its subject. The dial's black texture is not decorative abstraction; it is a considered attempt to capture water in motion, and at different angles it reads accordingly: sometimes flat and opaque, sometimes alive with reflected light. The 9RA5 is the calibre Grand Seiko built to make Spring Drive's glide-wheel regulation work harder. Its 120-hour power reserve means five full days unworn without winding, and its ±10 seconds per month accuracy sits well clear of what a conventional automatic can promise. High-intensity titanium keeps 43.8mm from feeling like 43.8mm on the wrist — the bracelet, matched in the same material and finished with a three-fold clasp, distributes 150 grams across the wrist evenly enough that the size reads as presence rather than weight. The power reserve indicator on the dial earns its place here because five days of reserve is long enough that you genuinely need to know where you are in it.
- Reference
- SLGA015G
- Brand
- Grand Seiko
- Collection
- Evolution 9Case Size: 43
- Case size
- 43.8mm
- Case thickness
- 13.8mm
- Lug width
- 23mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Spring Drive
- Calibre
- 9RA5
- Functions
- Date, Power reserve indicator
- Water resistance
- 200m
- Bracelet / strap
- Titanium bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- Luminous
- Condition
- Ex-display
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 51.5mm
- Power reserve
- 120 hours
Learn more about Grand Seiko
Grand Seiko began in 1960 as Seiko's attempt to build a watch to the highest standard in the world, judged against Swiss chronometer criteria rather than Japanese ones. The first model met the Bureaux Officiels standard, and the ambition was explicit: not a good Japanese watch, but a better watch than the Swiss were making.
The 1967 Grammar of Design, laid down by Taro Tanaka, still governs the aesthetic. Flat surfaces and sharp facets rather than curves; hands and markers cut to catch light in defined planes; every surface either mirror-polished or perfectly flat, with no in-between. The polishing is done by hand on tin plates — Zaratsu — which produces distortion-free reflections and cannot be replicated by machine.
The precision case was made at observatory trials in the 1960s, where Grand Seiko movements placed among the leaders in Geneva and Neuchâtel before the competitions ended.
The house's distinctive technology is Spring Drive, introduced in 1999 after nearly three decades of development. A conventional mainspring drives the watch, but the escapement is replaced by an electromagnetic brake regulated by a quartz oscillator: mechanical power, quartz accuracy, and a seconds hand that sweeps without ticking at all.
Grand Seiko was separated into a standalone brand internationally in 2017, with dials frequently drawn from Japanese landscape — the Snowflake among the best known.
- 1960
- The first Grand Seiko is built to Swiss chronometer standards.
- 1967
- Taro Tanaka codifies the Grammar of Design.
- 1968
- The 61GS Hi-Beat reaches 36,000 vibrations per hour.
- 1999
- Spring Drive combines mechanical power with quartz regulation.
- 2017
- Established as an independent brand worldwide.
Also in 5 collections
This watch appears in Watches 44mm and Over (928), Sports Watches (687), Dive Watches (468), Titanium Watches (145) and Pre-Owned, Ex-Display & Vintage Watches (100).
Manufacturer’s guarantee
What the specifications mean
A watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- 51.5mm lug-to-lug keeps the 43.8mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 43.8mm sits at the larger end
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 200m it is rated for swimming, snorkelling and recreational diving.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. Spring Drive is wound by the wrist and regulated electronically, with no battery.
How long does it run for when it's not worn?
About 120 hours fully wound — enough to sit off the wrist over a weekend and still be running.
What size strap does it take?
23mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 51.5mm, which suits wrists from roughly 17.5cm (7 inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Goldsmiths at £7,650, ex-display. No UK retailer we track lists this reference new.
Is this available new?
Not from the UK retailers we track. This reference is listed as ex-display only, at £7,650 from Goldsmiths. Ex-display watches are unworn shop stock rather than second-hand — sold below the recommended retail price, and with the manufacturer’s guarantee intact.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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