The Seiko Prospex SPB439J1 is a limited-edition 1968 Diver’s Re-interpretation GMT with a glacier-inspired silver-white dial, light-blue GMT hand and Seiko’s automatic Caliber 6R54. Seiko specifies a 42 mm steel case, 200 m diver’s water resistance and an approximately 72-hour power reserve. It is limited to 1,500 pieces; official listed prices vary by region.
What is the Seiko SPB439?
Seiko names it the “1968′ Diver’s Re-interpretation GMT Save the Ocean.” The SPB439, also identified as SPB439J1, pairs the Prospex diver design with a dual-time GMT display. Its silver-white dial has a fine striated texture and a light-blue GMT hand. Seiko says the dial pattern takes inspiration from polar glaciers.
The screw-down case back is marked as a limited edition and engraved with an individual serial number. The model belongs to Seiko’s Prospex diver GMT line; the company introduced Caliber 6R54 for Prospex diver GMT watches in a March 8, 2023 launch release.
How does the 6R54 GMT function work?
The automatic Caliber 6R54 can also be wound by hand. Its 24-hour hand tracks a second time zone, and Seiko says that hand can be adjusted independently in one-hour increments without stopping the hour and minute hands. That lets the wearer change the displayed second time zone while keeping local time running.
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Seiko lists 24 jewels, a stop-second function and an approximately 72-hour power reserve. Its stated accuracy range is +25 to -15 seconds per day. These are manufacturer specifications, not results from a test of an individual SPB439.
Case, bracelet and diver specifications
| Specification | Seiko listing |
|---|---|
| Case material | Stainless steel |
| Diameter | 42.0 mm |
| Thickness | 12.9 mm |
| Lug-to-lug | 48.6 mm |
| Lug spacing | 20 mm |
| Crystal | Sapphire with inner anti-reflective coating |
| Bezel | Ceramic display on a stainless-steel bezel |
| Luminescence | LumiBrite on hands, indexes and bezel |
| Bracelet and clasp | Stainless-steel bracelet; three-fold clasp with secure lock, push-button release and extender |
| Listed weight | 177.0 g |
| Water resistance | 200 m / 660 ft diver’s |
| Magnetic resistance | 4,800 A/m |
These are specifications on Seiko’s official SPB439 product page, which does not show a publication date. The 200 m diver’s rating is the listed water-resistance specification; it does not by itself establish suitability for every diving use or replace appropriate inspection and care.
Rank #2
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Will the SPB439 fit your wrist?
The 42.0 mm diameter is only one part of the fit. The 48.6 mm lug-to-lug span indicates how far the case reaches across the wrist, while its 12.9 mm thickness and listed 177.0 g weight also matter. Bracelet articulation, clasp bulk and wrist shape can change how those measurements feel in practice.
No physical watch was tested for this first look, so the dimensions cannot establish a personal fit. If possible, try it on and check how the lugs sit, how the bracelet drapes, and whether the clasp is comfortable. Seiko lists a 20 mm lug spacing; that measurement alone does not confirm that any particular replacement strap will attach or fit correctly.
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How limited is it, and what does it cost?
Seiko’s Middle East product page describes the SPB439 as a limited edition of 1,500 pieces. The same page lists USD 1,700, while Seiko’s UK product page lists GBP 1,600. These are region-specific official listing prices, not a universal price or a statement of current resale value. The pages were accessed October 4, 2026; check the relevant local Seiko page or retailer for live price, availability and terms.
For a purchase, search for “Seiko Prospex SPB439” or “SPB439J1 Arctic Ocean GMT.” Before buying, verify the exact model number, seller, condition, authenticity, included accessories, market and current price. Seiko’s regional collection pages provide retailer-finder routing; availability should be confirmed with the retailer.
Rank #4
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What to compare with other GMT divers
A useful comparison should use documented specifications on both watches rather than a broad claim that one is better. Check:
- Diameter, lug-to-lug length and thickness, alongside bracelet and clasp design.
- Whether the GMT hand adjusts independently and how it changes time zones.
- Stated power reserve and accuracy range, noting that specifications are not individual test results.
- Water-resistance rating, crystal and bezel materials.
- Limited-run quantity, local price, warranty and retailer terms.
Seiko’s 2023 release offers launch context for the 6R54 and related Prospex diver GMT models, but it is not a comparative test of the SPB439 against competing watches.
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Quick Recap
Best Value
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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.
