Photo: Uncommon Artifact
The White Birch turned the lights off: same Evolution 9 case, same 9SA5 — the birch forests of the Hiraniwa Plateau re-cut in black, at night.
Verdict
| What it is | Grand Seiko Evolution 9 SLGH017 "Night Birch" — 40mm high-intensity titanium, Calibre 9SA5 Hi-Beat 36000 |
| Price | $10,500 — Grand Seiko Boutique US list |
| Availability | Current production — Grand Seiko Boutique US |
| The angle | The birch texture reads as grain in daylight and as shadow at distance — the close and wide photographs here are the same watch. |
| Verdict | The 9SA5 is the movement argument; the dial is the reason it gets worn. |
The story
The SLGH017 shares its Evolution 9 case and its calibre with the White Birch, and changes the light. The dial's vertical grain — the bark of the white birch forests near the Shizukuishi studio — is rendered in black, for the same plateau at night. The case is high-intensity titanium, 40mm with wide lugs and a low centre of gravity, finished in alternating Zaratsu polish and hairline brushing. Inside is Calibre 9SA5: a 36,000 vph automatic with Grand Seiko's Dual Impulse Escapement, a free-sprung balance and twin barrels, good for 80 hours and rated at +5 to −3 seconds a day.
Photographed twice for the daily story series: close, where the grain is a texture, and wide, where it disappears into a black dial and the wide Evolution 9 hands and diamond-cut indexes do the reading. That double life is the judgement. Most textured dials are a close-up pleasure and a wrist-distance blur; this one is composed at both ranges, and the titanium keeps a flagship movement at 114 grams.
The wide shot: at wrist distance the grain goes quiet. Photo: Uncommon Artifact
Specs
| Reference | SLGH017 |
| Collection | Evolution 9 Collection |
| Movement | Calibre 9SA5 — Hi-Beat 36000 automatic, 47 jewels, Dual Impulse Escapement |
| Power reserve | 80 hours |
| Accuracy | +5 to −3 seconds per day, when static |
| Case | High-intensity titanium, 40.0mm diameter × 11.7mm thick × 47.0mm long |
| Dial | Black birch-grain texture, date at 3 o'clock |
| Crystal | Box-shaped sapphire, anti-reflective coating on the inside |
| Caseback | Sapphire display back |
| Bracelet | High-intensity titanium, three-fold clasp; 22mm lug width |
| Water resistance | 100 metres |
| Magnetic resistance | 4,800 A/m |
| Weight | 114 g |
What to check before buying
- Confirm the reference. The birch dial exists as the steel White Birch (SLGH005), the Spring Drive White Birch (SLGA009) and this titanium Night Birch. Case material and calibre separate them; price accordingly.
- Run the reserve down once. The 9SA5's 80 hours is the calibre's headline. A watch that stops well short needs a service conversation, not a discount shrug.
- Inspect the polished facets. Evolution 9 cases depend on crisp transitions between Zaratsu polish and hairline brushing. Soft edges mean polishing.
- Check the date change. It should snap over cleanly around midnight, not creep.
Price record
| SLGH017 | $10,500 — Grand Seiko Boutique US list |
Want one?
- In the shop: browse current stock — one-off pieces, and they turn over fast.
- Hunting one? Join the Want List — tell us the maker and the budget; pieces like this surface in our trawl most weeks.
- This one: the reference and factory specifications are at the See it at the Grand Seiko Boutique — the SLGH017 page. Not our listing. See Disclosure.
Related picks
- Grand Seiko SBGA211 — the Snowflake, in titanium
- Grand Seiko SBGX343 — the anti-magnetic quartz with two-colour lume
- Grand Seiko SBGR317 — the black-dial automatic
Photographed for the daily wrist-shot story series — not our stock, and not a sales listing. Disclosure
Get the Week's Finds every Sunday — the picks, what they went for, and what to check. Sign up in the footer of any page, or on the Newsletter page.