The Seiko Prospex SPB451, SPB453, and SPB455 are modern reinterpretations of Seiko’s 1965 diver, presented in March 2024. Their published core specifications are shared: the 6R55 automatic movement, an approximately 72-hour power reserve, a 40.0 mm case, and 300 m diver’s water resistance. The practical choice is mainly blue (SPB451), black (SPB453), or the charcoal-gray, gold-accented 100th-anniversary SPB455, which includes an additional fabric strap.
Choose between the SPB451 and SPB453 by dial color. Consider the SPB455 if you prefer its anniversary styling and included strap; compare current local prices and availability before deciding. Seiko’s published specifications do not establish that one reference performs better than another.
What are the Seiko SPB451, SPB453, and SPB455?
Seiko presented the trio in March 2024 as modern reinterpretations of its 1965 diver. Seiko describes that original watch as Japan’s first diver’s watch; that historical framing is the manufacturer’s. The 2024 references bring the design into the current Prospex lineup.
Enthusiasts sometimes call the preceding 2020 generation “20MAS” and the 2024 models “24MAS.” Those are collector shorthand, not Seiko’s formal product names.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →#1 Best Overall
- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable 43.8mm stainless steel watch case and bracelet.
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R35 CALIBER: equipped with the reliable caliber 4R35 automatic movement, this accurate men's watch keeps precise time
The main announced updates include the 6R55 movement with a three-day power reserve, 300 m water resistance, a date window moved from 3 o’clock to between 4 and 5 o’clock, shorter lugs, and a redesigned bracelet. Seiko says the new date placement makes the dial more symmetrical and leaves more room for Lumibrite. These are manufacturer-described changes; they should not be taken as a complete component-by-component comparison with every earlier reference.
SPB451 vs. SPB453 vs. SPB455: specifications
| Specification | SPB451 | SPB453 | SPB455 |
|---|---|---|---|
| Collection / edition | Prospex 1965 Diver, standard collection | Prospex 1965 Diver, standard collection | Prospex 1965 Diver, 100th-anniversary special edition |
| Dial and accents | Blue | Black | Charcoal gray with gold-colored accents |
| Movement | Seiko 6R55 automatic | Seiko 6R55 automatic | Seiko 6R55 automatic |
| Power reserve | Approximately 72 hours | Approximately 72 hours | Approximately 72 hours |
| Stated accuracy | +25 to -15 seconds per day | +25 to -15 seconds per day | 6R55 platform; consult the regional specification page |
| Case | Stainless steel; 40.0 mm diameter, 46.4 mm lug-to-lug, 13.0 mm thick | Same published core dimensions | Same published core dimensions |
| Crystal | Curved sapphire with inner anti-reflective coating | Same published core | Same published core |
| Water resistance | 300 m diver’s | 300 m diver’s | 300 m diver’s |
| Additional strap | Not specified in the cited announcement | Not specified in the cited announcement | Additional Seichu-braided strap made from recycled plastic bottles |
| US price information | USD 1,300 on Seiko’s US lineup page reviewed October 2026 | USD 1,300 on Seiko’s US lineup page reviewed October 2026 | No current US price verified in the research |
Seiko lists 24 jewels, manual and automatic winding, and stop-seconds functionality for the 6R55 movement. Its SPB451 specifications list 20 mm between the lugs, Lumibrite on the hands, indexes, and bezel, and a unidirectional rotating bezel. Prices and availability are regional and can change; the US figures above are not universal prices. Seiko’s March 2024 announcement listed launch-date European recommended prices of EUR 1,400 for the SPB451 and SPB453, and EUR 1,600 for the SPB455.
What changed from the preceding generation?
Case dimensions and shorter lugs
Seiko lists the new references at 40.0 mm in diameter, 13.0 mm thick, and 46.4 mm lug-to-lug. Seiko describes the redesign as having shorter lugs. These published dimensions are useful for comparison, but they do not establish how the watch will fit every wrist; the dossier contains no independent measurement or hands-on fit test.
The 6R55 and its three-day reserve
All three references use Seiko’s 6R55 automatic movement, which supports manual winding and stop seconds, has 24 jewels, and is specified for an approximately 72-hour (three-day) power reserve. Seiko’s March 2024 announcement describes this as a three-day reserve. Actual running time depends on the movement’s state of wind and use.
Free tools Windows power users keep installed
One-click scans. No signup required.
Seiko lists stated accuracy of +25 to -15 seconds per day on the official SPB451 and SPB453 specification pages. That is a manufacturer specification, not a chronometer certification or a measurement of every individual watch.
The date moves between four and five o’clock
The date window moves from 3 o’clock to between 4 and 5 o’clock. Seiko says the revised position makes the dial more symmetrical and provides more dial space for Lumibrite. Whether you prefer the new layout is a matter of taste.
Water resistance is 300 m
Seiko specifies 300 m diver’s water resistance for the three references. The company describes this as a first for its Prospex non-saturation divers; attribute that claim to Seiko rather than generalizing it to all Seiko watches.
Rank #2
- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
Seiko also specifies a curved sapphire crystal with inner anti-reflective coating, Lumibrite on the hands, indexes, and bezel, and a unidirectional rotating bezel. Water resistance can be affected by wear, damage, or service. If you plan to dive with a watch, follow Seiko’s care guidance and have its water resistance checked as appropriate.
Recommended Free Tools
What distinguishes each reference?
SPB451: blue dial
The SPB451 is the blue-dial standard-collection option. It shares the published core specifications with the SPB453. Choose it if you prefer blue and want the standard version of this platform.
For a direct model search, look for the Seiko Prospex SPB451. Confirm the exact reference, seller, warranty, and current availability before purchase.
SPB453: black dial
The SPB453 is the black-dial standard-collection option. Its published core specifications match those of the SPB451, so choosing between these two is primarily a color preference, not a documented performance difference.
Search for the Seiko Prospex SPB453 and check the seller and exact reference. Seiko’s US lineup page reviewed in October 2026 listed the SPB451 and SPB453 at USD 1,300 each; retailer prices and stock may differ.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →SPB455: 100th-anniversary special edition
The SPB455 is the charcoal-gray, gold-accented 100th-anniversary special edition. Its published core platform is shared with the standard references; its documented distinctions are the anniversary appearance and additional Seichu-braided strap made from recycled plastic bottles.
Seiko says the included strap has tensile strength nearly four times that of regular Seiko fabric straps, based on the company’s own research. Treat that as a manufacturer claim, not independent testing. No current US price for the SPB455 was verified in the research, so check local pricing and stock before comparing its cost with the standard models.
Rank #3
- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- LUMIBRITE DISPLAY: this men's dive watch features a highly-legible display with LumiBrite hands and markers
- STAINLESS STEEL: features a durable stainless steel watch case and bracelet, unique case shape resembling teeth, and PADI red and blue colors on its elapsed timing bezel
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
If its styling and strap suit you, search for the Seiko Prospex SPB455. Confirm the edition, included accessories, seller, and return terms.
The bracelet and strap options
Seiko describes the redesigned bracelet as using shorter links and a smaller clasp for comfort. The dossier does not include independent comfort testing, so treat that as Seiko’s design rationale rather than a verified fit outcome for every wearer.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesSeiko specifies 20 mm between the lugs for the SPB451. That measurement can help when shopping for straps, but it is not proof that a particular third-party bracelet or strap will fit. Verify the exact reference, attachment, thickness, spring-bar clearance, and end shape before buying. The SPB455 package includes an additional fabric strap; consult the regional product listing to confirm package contents.
For a third-party accessory search, a 20 mm watch strap is a starting point, not a guarantee of compatibility. A suitably sized spring-bar tool may help when changing a strap, but use care to avoid scratching the case.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which one should you buy?
| Choose | If you prefer | Documented distinction |
|---|---|---|
| SPB451 | Blue | Standard-collection blue dial |
| SPB453 | Black | Standard-collection black dial |
| SPB455 | Charcoal gray, gold-colored accents, and an additional strap | 100th-anniversary special edition and included Seichu-braided strap |
Choose the SPB451 if you want blue
The SPB451 is the standard-collection choice for buyers who prefer a blue dial. Seiko’s published core specifications match the SPB453; compare local price and availability as well as color.
Choose the SPB453 if you want black
The SPB453 is the black-dial choice. Its published core specifications match the SPB451, so there is no documented technical advantage over the blue model.
Free tools Windows power users keep installed
One-click scans. No signup required.
Choose the SPB455 if you want the anniversary edition
The SPB455 makes sense if you like its charcoal-gray dial, gold-colored accents, special-edition status, and included strap. Compare its current local price with the standard models; the research did not verify a current US price for this reference.
Rank #4
- KHAKI GREEN DIAL: this rugged sports watch features a khaki green dial patterned to mirror the shape of the bezel’s edge, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPE05 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a khaki green silicon strap, and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
Price, availability, and regional references
Seiko’s US lineup page reviewed in October 2026 listed the SPB451 and SPB453 at USD 1,300 each. Seiko’s March 2024 announcement listed European launch-date recommended prices of EUR 1,400 for those two models and EUR 1,600 for the SPB455. These are market- and date-specific figures, not universal current prices. The research did not verify a current US price for the SPB455.
Before purchase:
- Confirm the exact reference and regional version.
- Check whether the watch is new, unworn, pre-owned, or sold through a gray-market seller.
- Confirm the warranty and return terms.
- For the SPB455, verify that the additional fabric strap is included.
- Check current local pricing and availability with the seller.
Verdict
The SPB451, SPB453, and SPB455 share Seiko’s published 6R55 and 300 m diver’s-watch platform. The announced changes include the three-day power reserve, moved date window, shorter lugs, and redesigned bracelet; Seiko also describes the bracelet changes as intended to improve comfort.
Choose the SPB451 for blue, the SPB453 for black, or the SPB455 for its charcoal-gray and gold-colored anniversary styling and additional strap. Compare current local prices and availability, especially for the special edition. There is no documented performance difference that makes one reference the universal best buy.
FAQ
Are the SPB451, SPB453, and SPB455 technically different watches?
Seiko’s published core specifications are shared across the lineup, including the 6R55 movement, approximately 72-hour reserve, and 300 m diver’s water resistance. The documented differences are dial and edition details; the SPB455 includes an additional Seichu-braided strap.
Which should I choose, the SPB451 or SPB453?
Choose the SPB451 if you prefer blue, or the SPB453 if you prefer black. Seiko’s published core specifications are the same.
Is the SPB455 worth the price difference?
That depends on how much you value its charcoal-gray dial, gold-colored accents, special-edition status, and included strap. Check current local pricing: the research did not verify a current US price for the SPB455.
Will any 20 mm strap fit these watches?
No. The 20 mm lug spacing is an accessory clue, not proof of compatibility. Check the exact reference, attachment, thickness, spring-bar clearance, and end shape before buying.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallHow accurate is the 6R55 movement?
Seiko lists a stated accuracy range of +25 to -15 seconds per day on the official SPB451 and SPB453 specification pages. This is a manufacturer specification, not a chronometer certification or a prediction of an individual watch’s measured performance.
Quick Recap
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.
