Week of September 8, 2026

A weekly read on Japanese watchmaking and the broader watch market: releases, discontinuations, auctions, and where the money is actually moving.

The Week in Japan

Seiko Group posted numbers this month worth pausing on, even if you've never touched a spreadsheet. Q1 FY2027 (April to June 2026) watch division revenue hit ¥63 billion, or roughly $420 million, up 16% year over year, with operating margin climbing to 20.8% from 15.9%. The parent company's share price is up 42% over the past month and 392% over the trailing twelve, closing recently near ¥10,670. Grand Seiko specifically is “significantly outperforming” in the Americas, flat in Europe, according to the company's own reporting. Full-year guidance calls for ¥224 billion in watch sales, up from ¥203 billion the year before.

Read that as context for every price increase you've grumbled about since 2023: Seiko is not quietly cashing in on heritage nostalgia. It is executing a growth strategy, and it is working.

On the release side, September brought a wave of Seiko limited runs:

•       A Presage x TRADMAN'S BONSAI green-dial limited edition (2,000 pieces)

•       A Prospex 1965 European-exclusive diver (1,400 pieces)

•       A hand-enameled Presage “Craftsmanship” Laurel dial

•       Several Speedtimer Racing solar chronographs

•       A 500-piece Japan-exclusive orange diver with a Popeye caseback

None of it is flagship news, but it's the same pattern Seiko runs ahead of a price move: keep collector attention on affordable limited runs while the top of the pyramid gets repriced.

Discontinuation Watch

Here's the one that actually matters for collectors holding current-generation pieces. On June 24, 2026, Grand Seiko confirmed it is retiring the entire current Evolution 9 Hi-Beat 36000 lineup and replacing it with updated references carrying a redesigned, more tapered bracelet and a new three-step, tool-free micro-adjustment clasp:

•       SLGH005 “White Birch” is succeeded by SLGH031

•       SLGH011 “Green Birch” is succeeded by SLGH033

•       SLGH017 “Night Birch” is succeeded by SLGH029 (titanium)

•       SLGH021 “Genbi Valley” is succeeded by SLGH035

Worth being precise here: the movement is not changing. All four keep the in-house automatic caliber 9SA5 at 36,000 vph. This is a case and bracelet refresh, not a mechanical upgrade, and it's easy to find that detail garbled elsewhere online.

New retail lands at €10,400 for the steel references and €11,700 for the titanium Night Birch, roughly $12,090 and $13,610 at current exchange rates. The new references arrive in the permanent collection in October 2026. For comparison, Grand Seiko's own U.S. site currently lists the outgoing White Birch at $9,800, meaning this changeover is roughly a 23% step up at the register.

The Auction Ledger

Phillips opened its Geneva Sessions Fall 2026 online sale on Friday, September 4, with lots closing September 11. It's a 98-lot, Swiss-heavy catalog:

•       An F.P. Journe Tourbillon Souverain estimated at CHF 200,000 to 400,000

•       A Patek Philippe Nautilus at CHF 100,000 to 200,000

•       An A. Lange & Söhne Datograph “Lumen” in the same range

No Japanese watches in this particular catalog, which is itself worth noting: the major houses still treat Grand Seiko, Seiko, King Seiko, and Credor as a regional or specialist category rather than a Geneva mainstage one.

Zooming out, it's been a record year for the Swiss auction side generally. Phillips' New York Watch Auction XIV in June totaled $75.8 million, the highest-grossing watch auction in U.S. history, with seventeen F.P. Journe lots alone contributing $29.4 million of that total. Phillips' Geneva Watch Auction XXIII in May did $96.3 million across two days, led by a Patek 2523 “South America” world timer at $10.2 million, a record for the reference.

That gap, record-setting Swiss independent and vintage Patek results against essentially zero marquee-auction presence for Japanese watchmaking, is worth sitting with. It means Grand Seiko, King Seiko, and Credor pricing right now is being set almost entirely by retail and dealer channels rather than auction-house price discovery. For a category with this much production quality and this little secondary infrastructure, that's an interesting imbalance.

One research note for anyone digging through auction results on their own: a widely-circulated Bonhams “Making Waves: Seiko” sale keeps surfacing in searches without a year attached anywhere in the source material. Everything checkable about it points to 2020, not this year. If you see it cited as current news, it isn't.

The Price Tape

Both major watch-pricing trackers, WatchCharts and Chrono24, were blocking automated access at the time of this research, so the figures below come from Loupe.watch, cross-checked against dealer and marketplace listings where possible.

The outgoing White Birch (SLGH005) discussed above is trading actively: a tracked average of $7,129 across 127 listings, a range of $5,579 to $9,554, up 9.3% over the trailing year, against that $9,800 current retail. That's a healthy, liquid secondary market for a reference that's about to be replaced.

On the Credor side, the broader index (988 tracked listings) spans $381 to $17,229, reflecting how wide the Credor line runs, from accessible quartz pieces to hand-finished, limited-production dress watches like the Eichi and Phoenix families. Individual vintage JDM references in that line don't have clean tracked comps at all right now. They trade on relationships and specialist dealer networks, not index charts, which is worth knowing if you're pricing one against a website number.

The Microbrand Watch

Naoya Hida's 2026 collection, announced in April, included the brand's first chronograph: the NH Type7A, a 36mm, 904L steel case built around a vintage-restored Valjoux 236 hand-wound movement, styled after the Patek Philippe reference 1463 “Tasti Tondi.” Ten pieces, priced at ¥5,300,000, or roughly $38,300, sold through a four-day ordering window in May. It's the clearest signal yet that the top tier of Japanese independent watchmaking can charge genuinely Swiss-independent money and still find buyers.

At the other end of the price spectrum, Kurono Tokyo's 2026 Anniversary Malachite launched at $1,850 retail on May 28, sold out inside its ordering window (collectors report it closed in under 90 seconds), and by July was already listed on the secondary market as a full-set flip near $3,650, close to double retail in under two months. No microbrand out of Japan, or arguably anywhere, is turning over allocation this fast at this price point right now.

The Verdict

So: is the outgoing Evolution 9 Hi-Beat “Birch” family (the White Birch, Green Birch, Night Birch, and Genbi Valley references being replaced this October) overpriced or underpriced on the secondary market today?

Underpriced, and here's the reasoning. The watch itself isn't changing. Same case, same dial, same in-house 9SA5 movement at 36,000 vph. The only material difference between the outgoing reference and its October successor is a bracelet taper and a nicer clasp, and the new version costs roughly 23% more at retail. That is not a small gap for a running change. Historically, when Grand Seiko has done a cosmetic-only refresh rather than a movement change, the outgoing reference has tended to hold value rather than get dumped, because nothing about the watch on the wrist actually changed, only the price of buying it new did. Add in a parent company whose stock is up nearly 400% over the trailing year on real revenue growth, not hype, and the ingredients are in place for the current White Birch and its siblings to be more sought after in six months than they are today, not less.

The risk to that view is straightforward: if enough buyers decide the new bracelet and clasp are worth paying for, demand could shift toward the incoming references instead, leaving outgoing stock to soften. That's the scenario worth watching over the next quarter. But based on what changed and what didn't in this update, the smarter side of that bet looks like the watch that's already out in the world.

Sources: WatchPro (Aug 10, 2026); Nikkei Asia; Time.news (Sept 1, 2026); Monochrome Watches (June 24, 2026 and May 19, 2026); Phillips; Canadian Jeweller (July 6, 2026); Loupe.watch; grand-seiko.com; tradingeconomics.com.