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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Seiko’s SPB451 and SPB453 are regular-production models in the 2024 1965 Heritage Diver’s Watch family; the SPB455 is its 100th-anniversary special edition. Seiko lists all three with the same 6R55 movement, 72-hour power reserve, 300 m diver’s water resistance, and 40.0 mm by 13.0 mm case measuring 46.4 mm lug-to-lug. The documented choice is mainly styling, edition status, and whether the SPB455’s included additional strap is worth the price difference in your market.
“24MAS” is enthusiast shorthand for this 2024 generation, not Seiko’s official family name. Seiko presents the watches as part of its 1965 Heritage Diver’s Watch line, connecting them to the company’s original 1965 diver.
What is the difference between the SPB451, SPB453, and SPB455?
The SPB451 and SPB453 are regular-production references, while the SPB455 is the 100th-anniversary special edition. Seiko describes the SPB455’s styling as charcoal-grey with gold-coloured accents and says it includes an additional Seichu-braided strap made from recycled plastic bottles. Seiko’s announcement gives the trio the same core specifications.
| Model | Edition | Documented distinction | How to choose |
|---|---|---|---|
| SPB451 | Regular production | Part of the shared 1965 Heritage Diver’s Watch family | Compare current official product images and listings for the appearance you prefer. |
| SPB453 | Regular production | Part of the shared 1965 Heritage Diver’s Watch family | Compare current official product images and listings for the appearance you prefer. |
| SPB455 | 100th-anniversary special edition | Charcoal-grey and gold-coloured styling; additional recycled-polyester Seichu-braided strap | Consider it if the anniversary styling and extra strap justify its local price difference. |
The research available for this guide did not verify exact SPB451 and SPB453 color descriptions from Seiko’s text, current regional reference codes, or present-day prices and stock. Check the relevant official listing or seller before buying. “Special edition” alone does not establish a limited production quantity or future collectibility.
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What are the shared Seiko 24MAS specifications?
Seiko’s 2024 product-family announcement lists the following shared specifications. These are manufacturer figures, not independent measurements.
| Specification | Seiko-listed detail |
|---|---|
| Movement | Calibre 6R55 automatic, 24 jewels |
| Power reserve | 72 hours |
| Water resistance | 300 m diver’s |
| Case material | Stainless steel with super-hard coating |
| Case dimensions | 40.0 mm diameter; 46.4 mm lug-to-lug; 13.0 mm thick |
| Crystal | Curved sapphire with anti-reflective coating on the inner surface |
| Other details | Screw case back, screw-down crown, Lumibrite on hands and indexes, 4,800 A/m magnetic resistance |
| Bracelet | Stainless steel, with three-fold clasp, push-button release, secure lock, and extender |
| Date | Positioned between four and five o’clock |
Seiko’s 1965 Heritage Diver’s Watch product-family information is the source for the shared specifications and the SPB455’s special-edition details.
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- Stainless Steel case with Black Resin Band
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- Water-resistant to 200 M (660 feet)
How does the 24MAS compare with the SPB143?
Seiko’s 2024 announcement compares the new family with the SPB143 generation introduced in 2020. It highlights the increase in stated water resistance and power reserve, the relocated date, compact dimensions, and added Lumibrite area.
| Feature | SPB143 generation | SPB451, SPB453, SPB455 |
|---|---|---|
| Water resistance | 200 m | 300 m diver’s |
| Power reserve | 70 hours | 72 hours |
| Date position | At 3 o’clock | Between four and five o’clock |
| Case dimensions | See the relevant SPB143 listing | 40.0 mm diameter, 46.4 mm lug-to-lug, 13.0 mm thick |
These comparison figures and design changes are from Seiko’s announcement; they are not an independent fit or performance test. Dimensions can help with an initial fit assessment, but they cannot establish how a watch will sit on an individual wrist. Try it on where possible.
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- [Waterproof] Water resistant to 50m (165ft) -suitable for short periods of recreational swimming and showering, but not diving or snorkeling
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What is notable about the SPB455 strap?
The SPB455 includes an additional strap made from recycled plastic bottles and braided using the Japanese Seichu technique, according to Seiko. Seiko also claims its tensile strength is nearly four times that of regular Seiko fabric straps; that is the manufacturer’s research claim, not an independent test result. Separate purchase availability for the strap was not established.
How much does the Seiko 24MAS cost?
No current, market-wide price comparison was established. Seiko’s March 2024 announcement listed Australian recommended retail prices of AUD $1,995 for the SPB451 and SPB453 and AUD $2,350 for the SPB455. These are dated, regional launch prices, not current quotes.
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| Market and date | Models | Published price | Context |
|---|---|---|---|
| Australia, March 2024 | SPB451 and SPB453 | AUD $1,995 | Seiko-announced recommended retail price at launch |
| Australia, March 2024 | SPB455 | AUD $2,350 | Seiko-announced recommended retail price at launch |
For a purchase today, check the current listing for your market and confirm the reference, seller, warranty, availability, and total price. Seiko’s announcement said the models would be available through Seiko Boutiques and select retailers worldwide from June 2024; that launch statement does not confirm present inventory.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which 24MAS model should you buy?
Seiko lists the same principal movement and case specifications across the three references, so base the decision on the appearance you prefer, whether you want a regular model or anniversary edition, and the current local price and seller terms.
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- WRIST WATCH BAND: Brown, genuine leather band with a secure adjustable buckle closure for a customized fit of this wristwatch; interchangeable with all 22mm Fossil watch straps
- WATER RESISTANT MEN'S WATCHES: Up to 50m (165ft); wearable for short periods of recreational swimming and showering, but not diving or snorkeling; 5 ATM
- Compare current official product images or listings to decide which dial and bezel appearance you prefer, especially for the SPB451 and SPB453.
- Decide whether the SPB455’s charcoal-grey and gold-coloured styling, anniversary status, and included additional strap justify its market-specific price difference.
- Check whether the 40.0 mm diameter, 46.4 mm lug-to-lug, and 13.0 mm thickness suit you; try the watch on if possible rather than assuming fit from dimensions alone.
- Verify the live price, availability, warranty, and seller for your region before ordering.
FAQ
What does “24MAS” mean?
“24MAS” is enthusiast shorthand for the 2024 generation of Seiko’s 1965 Heritage Diver’s Watch family. It is not the official name used in Seiko’s announcement.
Is the SPB455 mechanically different from the SPB451 and SPB453?
Seiko’s announcement lists the same core movement, dimensions, and water-resistance rating for all three. The documented SPB455 distinctions are its charcoal-grey and gold-coloured styling and additional recycled-polyester Seichu-braided strap.
What is the 6R55 power reserve?
Seiko lists a 72-hour power reserve for the 6R55 in this watch family.
What is the SPB455’s additional strap made from?
Seiko says it is made entirely from recycled plastic bottles and uses the Japanese Seichu braiding technique. The claim that it has nearly four times the tensile strength of regular Seiko fabric straps is Seiko’s own research claim.
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Verify the exact reference and appearance in a current official listing, try the dimensions on your wrist if possible, and confirm local price, availability, warranty, and seller terms.
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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.
