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The Grand Seiko SBGW323 is a hand-wound 44GS-style watch with a 36.5 mm stainless-steel case and a purple dial inspired by the kiri flower. Grand Seiko classifies it in the Heritage Collection on its US product page, not the Elegance Collection. Its defining combination is a pressed Mt. Iwate dial pattern, the 9S64 mechanical movement and a stated power reserve of about 72 hours.
What is the Grand Seiko SBGW323 Kiri?
SBGW323 is Grand Seiko’s modernized interpretation of its 44GS design. The brand says the purple dial takes its color inspiration from kiri, Iwate Prefecture’s official flower, and pairs it with a pressed pattern representing the ridges of Mt. Iwate. The result is a dress-oriented design in a relatively compact steel case, with a manually wound movement rather than an automatic one.
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Although the assigned title calls it “Elegance,” Grand Seiko’s US model page lists the SBGW323 under the Heritage Collection. Use that as the official collection classification.
Grand Seiko SBGW323 specifications
| Specification | Grand Seiko listing |
|---|---|
| Reference | SBGW323 |
| Collection on US page | Heritage Collection |
| Case material | Stainless steel |
| Case diameter | 36.5 mm |
| Lug-to-lug | 42.7 mm |
| Thickness | 11.6 mm |
| Crystal | Box-shaped sapphire, with anti-reflective coating on the inner surface |
| Band width | 18 mm |
| Movement | Caliber 9S64, manual winding, 24 jewels |
| Power reserve | Approximately 72 hours |
| Water resistance | 10 bar |
| Magnetic resistance | 4,800 A/m |
| US price shown | USD 5,900 on Grand Seiko’s US page when accessed on October 8, 2026; price and availability may change |
These are manufacturer-published specifications. The official Grand Seiko US page provides the model details and displayed US price; the Grand Seiko Boutique US listing also describes the manual movement.
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- See-through case back
- Date display
- Screw-down crown
- 40mm Diameter
- Weight 178.0 g
How large is the SBGW323 on the wrist?
The case measures 36.5 mm across, 42.7 mm from lug to lug and 11.6 mm thick. Diameter alone does not describe how a watch wears: lug-to-lug length helps indicate how far it spans across the wrist, while thickness gives a sense of its height. Grand Seiko publishes these dimensions, but they are not a substitute for trying the watch on; wrist shape and personal fit preference matter.
The stated 18 mm band width describes the band measurement, not confirmed compatibility with every aftermarket strap, bracelet, clasp or replacement part. Check the exact attachment and fit before buying accessories.
Rank #2
- Three-fold clasp with push button release
- Dual-curved sapphire crystal
- Power reserve display on the back
- Power resrve Approx. 72 hours(3 days)
What movement is in the SBGW323, and how accurate is it?
The SBGW323 uses Grand Seiko caliber 9S64, a 24-jewel, manually wound mechanical movement. Grand Seiko lists an approximate 72-hour power reserve—about three days—and says: “The manually wound mechanical movement features a maximum continuous power reserve of 72 hours (about three days).”
Grand Seiko publishes two accuracy figures that describe different conditions:
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- 24-hour hand (dual time display function)
- Power Reserve Approx. 55 hours
- See-through case back
- Mean daily rate: +5 to -3 seconds per day. This is measured by Grand Seiko under controlled conditions before the movement is fitted into the case.
- Normal-usage accuracy: +10 to -1 seconds per day. This is the manufacturer’s stated range for use outside that controlled measurement.
These are Grand Seiko specifications, not independent test results or a guarantee that an individual watch will keep exactly the same rate in every wearer’s conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do its water and magnetic resistance ratings mean?
Grand Seiko lists water resistance at 10 bar and magnetic resistance at 4,800 A/m. These are the manufacturer’s ratings; the figures alone do not establish suitability for every activity or exposure. Follow Grand Seiko’s care guidance for the watch and have its condition checked as appropriate, particularly if it has been damaged or serviced.
Rank #4
- Featuring a Black Band, Silver-tone Case, Scratch Resistant Hardlex Crystal
- Box-shaped Hardlex crystal
- Second hand halt mechanism (Hacking)
What does the SBGW323 cost?
Grand Seiko’s US product page displayed a price of USD 5,900 when accessed on October 8, 2026. That is a US-market listing at that point in time, not a promise of today’s price, stock or pricing in other countries. Check the official US listing or an authorized retailer for current local availability and pricing.
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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.
