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The Seiko Presage SPB445 is a Classic Series “Craftsmanship” watch distinguished by a handmade white Arita porcelain dial. Seiko lists it at USD 1,900 on its US product page and SGD 2,725 on its Singapore page; those are market-specific listed prices, not a guarantee of current retailer pricing. Its key practical details are a 40.6 mm steel case, automatic 6R5H movement with about 72 hours of power reserve, and 10 bar water resistance.
What is the Seiko Presage SPB445?
SPB445 belongs to Seiko’s Presage Classic Series “Craftsmanship” collection. Its defining feature is a white “Hakuji” Arita porcelain dial, paired with a stainless-steel bracelet and a mechanical automatic movement. Seiko places this model among Presage watches that combine Japanese decorative craft with mechanical watchmaking, alongside dial traditions such as enamel and urushi lacquer (Seiko SPB445 product page; Seiko Craftsmanship overview).
What makes the Arita porcelain dial different?
Handmade surface and expected variation
Seiko describes the 31.6 mm dial as handmade and fired at high temperature, with a transparent glaze over its white porcelain surface. The dial has bar indexes, a patterned area within the indexes, and a recessed subdial at six o’clock. Because the surface is crafted and fired rather than produced as a perfectly uniform printed dial, Seiko warns that small dimples, dots, or uneven color may appear. The brand presents these as individual characteristics of genuine Arita porcelain dials, not as proof that every example will look identical (Seiko SPB445 product page).
That distinction matters when inspecting photographs or a watch in person: slight surface variation is consistent with Seiko’s description, but an imperfection by itself cannot establish authenticity or determine whether an individual watch is damaged. Buyers who expect an entirely uniform surface should examine the particular watch before purchase and clarify the seller’s return terms.
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Arita’s craft history
Seiko credits Arita porcelain master craftsman Hiroyuki Hashiguchi and fellow Arita makers, working with the Presage team, with developing the porcelain dials. Seiko’s overview places the origin of Japan’s first porcelain in Arita in the early 17th century. Separately, it says the manufacturer associated with this craft has made porcelain since 1830; that date is about the maker’s history, not the SPB445’s release date (Seiko Arita craft overview).
SPB445 specifications
| Specification | Seiko-listed detail |
|---|---|
| Model | SPB445, Presage Classic Series “Craftsmanship” Arita Porcelain Dial |
| Movement | Caliber 6R5H, automatic with manual winding; 24 jewels |
| Power reserve | Approximately 72 hours (three days) |
| Stated precision | +25 to −15 seconds per day |
| Functions | 24-hour hand; stop-seconds function |
| Case | Stainless steel with super-hard coating |
| Case dimensions | 40.6 mm diameter; 12.5 mm thick; 49.1 mm lug-to-lug |
| Crystal | Dual-curved sapphire; anti-reflective coating on inner surface |
| Dial | 31.6 mm white “Hakuji” Arita porcelain with transparent glaze |
| Bracelet and clasp | Multi-row bracelet; three-fold clasp with push-button release |
| Water resistance | 10 bar |
| Magnetic resistance | 4,800 A/m |
| Weight | 150.0 g |
| Lug spacing | 20 mm |
| US listed price | USD 1,900 on Seiko’s US product page |
These are manufacturer-published specifications, not independent test results. In particular, the stated daily precision is Seiko’s specification; it does not establish how accurately a given watch will run in every wearer’s conditions. The full current specification listing is on Seiko’s SPB445 page.
Rank #2
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How much does the SPB445 cost?
Seiko’s US page lists the SPB445 at USD 1,900, while its Singapore page lists SGD 2,725 (US listing; Singapore listing). These figures are regional listings and should not be treated as a direct currency comparison, a current street price, or confirmation of local stock. Check Seiko or an authorized local retailer for the price and availability applicable to your market.
How to judge fit before buying
The useful case measurements to compare with a watch you already wear are the 40.6 mm diameter, 12.5 mm thickness, and 49.1 mm lug-to-lug length. Those dimensions are more informative together than diameter alone when judging how much of the watch may span the wrist. Seiko lists a 20 mm lug spacing, but that figure alone does not confirm compatibility with a particular third-party strap, bracelet, or end link.
Rank #3
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What to weigh against other Presage craft-dial watches
Seiko’s Classic Series includes enamel, urushi lacquer, Arita porcelain, and an unglazed Arita porcelain model. The most useful comparison is model by model: dial material and finish, case dimensions, movement and reserve, water resistance, bracelet or strap configuration, limited-edition status, and the price in your market. Do not assume that another Presage craft-dial watch shares SPB445’s size or movement; verify the individual model’s specifications on its product page (Seiko Craftsmanship lineup; Seiko Presage collection).
Quick Recap
Best Value
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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.
