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Seiko’s new 5 Sports SKX watches, the HDB004 “Formal White” and HDB005 “Tweed Green,” are listed as October 2026 releases and were reported available in the US, UK, Europe, India and Australia. That is a launch snapshot across five markets, not proof of stock in every country or at every retailer. Both are automatic mechanical watches with a 4R36 movement, a 42.5 mm case and 10 bar water resistance; neither should be described as a professional dive watch.
Where the Seiko HDB004 and HDB005 are available
Seiko’s UK HDB004 page and Australian HDB005 page identify the watches as 5 Sports SKX-series models and give October 2026 as their release month. Seiko UK’s HDB004 page and Seiko Australia’s HDB005 page provide the official model details.
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SEIKO SSK001 Automatic Watch for Men - 5 Sports GMT, SKX Series - Blue | Buy on Amazon |
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Notebookcheck reported on October 6, 2026, that both watches were available through Seiko Boutiques and authorized retailers in the US, UK, Europe, India and Australia. “Globally” in that context means availability across those named markets; the report does not establish availability in every country or confirm stock at a particular shop. Check Seiko’s regional site or retailer finder for current local availability.
Formal White or Tweed Green: what is different?
| Model | Dial and bezel | Accents |
|---|---|---|
| HDB004 “Formal White” | White dial with a black bezel | Yellow-gold-colored hands, markers and bezel accents |
| HDB005 “Tweed Green” | Deep green dial with a matching green bezel | Rose-gold-tone hands and markers |
The visual descriptions come from Notebookcheck’s October 6, 2026, launch report. It characterizes the pair as drawing on an older SNZH design with an SKX-inspired silhouette; Seiko’s official product pages reviewed here establish the models and specifications but do not confirm that design lineage. If the watches otherwise suit you, the main distinction is the colorway.
#1 Best Overall
- BLUE DIAL: this handsome men’s watch features a striking deep blue dial with luminous dial indicator hands and markers and date calendar to keep you organized
- BLUE & BLACK BEZEL: with a 24-hour bezel and easy-to-read fourth hand, this GMT watch helps you keep time as you travel
- DURABLE UTILITY: these versatile men’s wrist watches feature a 42.5mm stainless steel watch case and bracelet, for a classic, timeless look.
- WATER-RESISTANT: this rugged sports watch is water-resistant up to 100 meters
- 4R34 CALIBER: equipped with the reliable 4R34 caliber, these automatic watches for men ensure the most accurate in self winding timekeeping, with 41 hours of reserve power and manual winding option
Shared specifications and wrist fit
Seiko’s UK HDB004 and Australian HDB005 product pages list a common mechanical platform and nearly identical core dimensions. The listed measurements can help gauge fit, but wrist comfort cannot be inferred from case size alone.
| Specification | HDB004 and HDB005 |
|---|---|
| Movement | Seiko 4R36 automatic with manual winding; 24 jewels |
| Power reserve | Approximately 41 hours |
| Functions | Stop-seconds function; day and date display |
| Case | Stainless steel; 42.5 mm diameter, 14.2 mm thick |
| Lug-to-lug and lug width | 46.0 mm lug-to-lug; 22 mm between lugs |
| Crystal and lume | Curved Hardlex crystal; LumiBrite on hands and indices |
| Water resistance | 10 bar (100 m) |
| Bezel and caseback | Unidirectional rotating bezel; see-through, screw-down caseback |
| Bracelet clasp | Three-fold clasp with secure lock |
These figures are from Seiko’s UK HDB004 specifications and Australian HDB005 specifications. The official Indian listing for the HDB005K1 also gives a 4R36 movement, approximately 41-hour reserve, 42.50 mm diameter and 10 bar resistance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.10 bar water resistance is not a professional-diver claim
Seiko lists both watches at 10 bar, or 100 m, water resistance. Notebookcheck explicitly cautions that they are not professional divers. The rating alone does not establish professional-diver certification or determine whether a particular water activity is appropriate; do not treat it as a substitute for guidance in Seiko’s documentation about use and maintenance.
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Regional prices reported for the launch
| Market and model | Price | Source and qualification |
|---|---|---|
| United Kingdom, HDB004 | £340 | Listed on Seiko’s UK product page, accessed in 2026 |
| Australia, HDB005 | AUD 650 | Listed on Seiko’s Australian product page, accessed in 2026 |
| India, HDB005K1 | ₹45,000 | Listed in Seiko Watches India’s online store, accessed in 2026 |
| US and Europe | $400 / €400, respectively | Notebookcheck’s October 6, 2026 launch-price summary; it does not assign those prices to a specific model |
The $400, £340, €400, ₹45,000 and AUD 650 figures were reported together by Notebookcheck as launch prices across the markets it covered; its summary does not map every currency to a specific model. The UK, Australian and Indian prices above are tied to the specific official listings available for those regions. Prices and stock can change, so verify the current regional listing before buying.
Quick Recap
Which one makes more sense for you?
- Choose by appearance: HDB004 pairs a white dial with a black bezel and yellow-gold-colored accents; HDB005 uses green with rose-gold-tone accents.
- Check the dimensions against your wrist: the 42.5 mm diameter, 46 mm lug-to-lug length and 14.2 mm thickness are the practical starting points when judging fit.
- Compare the local price: the documented figures vary by region, and the broader launch-price report does not establish a universal price or model-by-model currency map.
- Buy from a regional Seiko source or authorized retailer: a launch availability report is not confirmation that a given retailer still has inventory.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
