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There is no fair single answer until you name the Seiko Prospex reference: Prospex is a collection, not one watch. Against the Orient Star Diver 1964 2nd Edition RE-AU0601B, the Seiko SPB453 is a useful comparison—but the available official figures are from different markets, and they do not establish a universal winner. Choose based on the exact local price, fit and specifications of the Seiko model you are considering.
Which Seiko Prospex is being compared?
For a focused comparison, this article uses the Seiko Prospex SPB453, identified by Seiko as a 1965 Heritage Diver’s Watch. Seiko’s official US lineup lists it at USD 1,300. That is a US list price, not a quote for every market or seller. Seiko’s US Prospex lineup is the place to verify the model and current listing.
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Prospex also includes watches at substantially different specifications and prices. Seiko’s May 14, 2026 announcement, for example, lists limited editions HBC005 and HBB001 at US recommended retail prices of USD 1,400 and USD 595 respectively. Those models are not substitutes for the SPB453 in a direct comparison; they show why a collection name alone cannot identify a like-for-like rival.
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The Orient’s official UK product page provides a detailed specification set for RE-AU0601B. Seiko’s lineup page provides the SPB453’s US price, but a definitive feature-by-feature comparison requires checking the exact Seiko product page for its dimensions and other specifications. The published figures below should therefore be read as reference points, not as a complete head-to-head test.
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| Item | Orient Star RE-AU0601B | Seiko Prospex SPB453 |
|---|---|---|
| Price and market | £999.99 on Orient Watches UK’s product page, accessed in 2026; UK listing, not a global price guarantee. | USD 1,300 on Seiko’s official US Prospex lineup observed in 2026; US list price. |
| Case dimensions | 41.0 mm wide; 49.6 mm lug-to-lug; 14.5 mm thick, per Orient Watches UK. | Not stated on the cited Seiko lineup page; check the exact model page. |
| Movement and reserve | F6N47 automatic; hand winding and hacking; 22 jewels; 50-hour power reserve, per Orient Watches UK. | Not stated on the cited Seiko lineup page; check the exact model page. |
| Crystal and water resistance | Sapphire crystal; 200 m water resistance. Orient says the watch complies with ISO 6425 for air diving watches. | Not stated on the cited Seiko lineup page; check the exact model page. |
| Included configuration | Bracelet and silicone strap are listed by Orient Watches UK. | Not stated on the cited Seiko lineup page; check the exact model page. |
Because the listed prices are in pounds for the Orient and US dollars for the Seiko, they are not a same-market price comparison. Local taxes, availability, seller pricing and included configuration can change what a buyer actually pays. Compare current offers in the same country before deciding which is better value.
How does the Orient Star Diver 1964 2nd Edition stand on its own?
Orient Star’s official UK page lists RE-AU0601B as a 41 mm diver with a 49.6 mm lug-to-lug span and 14.5 mm thickness. Those measurements are more informative for fit than diameter alone: lug-to-lug length affects how the watch spans the wrist, while thickness affects how it sits under a cuff. The 20 mm lug width, bracelet and silicone strap are also listed, giving buyers two stated wearing configurations.
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The listed F6N47 is an automatic movement with hand winding and hacking, and the UK page gives it a 50-hour power reserve. Orient’s May 10, 2022 announcement describes the reserve as over 50 hours. The same announcement identifies a screw-down crown, screw caseback, dual-curved sapphire crystal with anti-reflective coating and 200 m water resistance compliant with ISO 6425. These are manufacturer-published specifications, not independent measurements of timekeeping or performance.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOrient says the design draws on the Calendar Auto Orient, one of the company’s early dive watches released in 1964. That is useful design context, but heritage by itself does not establish superior construction, reliability or value.
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What distinguishes the wider Prospex range?
The May 14, 2026 Seiko announcement illustrates the range’s variation. HBC005 is described as a limited-edition 40.0 mm watch with Caliber 6R55, a 72-hour power reserve and 300 m diver water resistance; Seiko gives a US recommended retail price of USD 1,400. HBB001 is described as a limited-edition 41.7 mm watch with Caliber 4R35, a 41-hour reserve and 200 m diver water resistance; its US recommended retail price is USD 595. These are announcement-date figures and may change.
Those examples do not establish how the SPB453 compares with the Orient on movement, fit or diving specification. They establish that a Prospex recommendation needs a model number. Seiko’s official history traces its dive-watch milestones to its 1965 diver; that history, like Orient’s 1964 reference, is brand context rather than evidence that one modern watch is better made.
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How to make the buying decision
- Match the reference and market. Confirm that the Seiko is the SPB453—or write down the alternative’s exact model number—and compare current local prices for both watches. Account for seller, warranty and the bracelet or strap configuration included.
- Check fit using more than case diameter. Compare case diameter, lug-to-lug, thickness, weight and bracelet geometry for the exact Seiko and Orient. The Orient’s published dimensions are 41.0 mm, 49.6 mm lug-to-lug and 14.5 mm thick; do not assume the Seiko wears similarly because its diameter is close.
- Compare the specifications that matter to your use. Verify the Seiko’s movement, stated accuracy range, reserve, winding and hacking features, crystal, bezel, lume, clasp and any strap options on its model page. Do not infer measured accuracy from a movement name.
- Read the water-resistance wording carefully. A depth rating is not automatically equivalent to a stated ISO 6425 diver-watch compliance claim. Confirm the exact wording for the Seiko reference if formal diver-watch compliance matters to you.
- Choose on design and documented value, not just heritage. Both brands provide historical context for their diver designs. Decide which watch’s shape, dial and wearing configuration you prefer, then weigh that against the price and verified specifications in your market.
Verdict: which is the better buy?
The Orient Star RE-AU0601B is the more straightforward choice if you value a detailed published specification set—including sapphire, a 50-hour reserve, 200 m water resistance and stated ISO 6425 compliance—and its design and fit suit you. The Seiko SPB453 is a credible named Prospex comparison at a listed US price of USD 1,300, but the cited lineup information is not enough to declare it the better buy on dimensions or features. If you are considering another Prospex, compare that exact reference instead. The better purchase is the one whose verified local price, fit and documented specifications best match your priorities.
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Sources
- Orient Watches UK: Diver 1964 2nd Edition RE-AU0601B
- Orient Star, May 10, 2022: “Orient Star’s New Diver 1964 2nd Edition with 200-metre Water Resistance”
- Seiko Watch Corporation: US Prospex lineup
- Seiko Watch Corporation, May 14, 2026: Prospex limited-edition announcement
- Seiko Watch Corporation: company history
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.
