The Grand Seiko STGK031 and STGK033 share the same compact 30 mm stainless-steel 62GS design and automatic calibre 9S27. The key difference is the dial: STGK031 is pink, while STGK033 is silver. Their published dimensions, water resistance and approximately 50-hour power reserve are otherwise shared.
STGK031 vs. STGK033: what changes?
Grand Seiko gives the pink-dial STGK031 the name Sakura-Kakushi and the silver-dial STGK033 the name Sakura-Tukiyo. The names and seasonal imagery are part of the maker’s design descriptions; they do not indicate different movements or case specifications.
| Specification | STGK031 | STGK033 |
|---|---|---|
| Dial | Pink; Sakura-Kakushi | Silver; Sakura-Tukiyo |
| Case material | Stainless steel | Stainless steel |
| Case dimensions | 30.0 mm diameter × 36.2 mm length × 10.5 mm thick | 30.0 mm diameter × 36.2 mm length × 10.5 mm thick |
| Movement | Calibre 9S27, automatic with manual winding | Calibre 9S27, automatic with manual winding |
| Stated power reserve | Approximately 50 hours | Approximately 50 hours |
| Crystal and caseback | Box-shaped sapphire crystal with inner anti-reflective coating; screw-down see-through caseback | Box-shaped sapphire crystal; the Japanese listing describes the same line construction |
| Water resistance | 10 bar (10 atmospheres) | 10 bar (10 atmospheres) |
| Bracelet | Stainless steel; 15 mm width in the Japanese listing | Stainless steel; 15 mm width in the Japanese listing |
Specifications are from Grand Seiko’s official STGK031, STGK033, Japanese STGK031 and Japanese STGK033 product listings.
How the two dials differ
STGK031: pink Sakura-Kakushi
The STGK031 is the pink-dial option. Grand Seiko’s launch framing links the pair to cherry blossoms and Japan’s changing seasons. Choose this reference if you prefer the pink treatment; the official specifications do not indicate a mechanical distinction from the STGK033.
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STGK033: silver Sakura-Tukiyo
Grand Seiko says the STGK033’s silver dial takes inspiration from “Sakuratsukiyo,” cherry blossoms viewed beneath a hazy moon. Its description connects the misty image to spring temperature differences. This is the brand’s account of the design inspiration, not a claim that the dial will look identical in every light.
Shared 62GS case and wrist fit
Both references measure 30.0 mm across, 36.2 mm from end to end and 10.5 mm thick, according to Grand Seiko’s product specifications. Those figures provide a useful starting point when judging fit, but they do not by themselves establish how a watch will sit on a particular wrist. The Japanese listings give a 15 mm bracelet width.
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Grand Seiko traces the 62GS design to 1967, describing it as its first automatic-winding mechanical model. The STGK033 listing says the bezel-free construction opens up the view of the dial and highlights sharply finished, multifaceted case surfaces associated with Zaratsu polishing. These 30 mm watches reinterpret that design at a smaller case size.
Movement, accuracy and everyday specifications
Each watch uses Grand Seiko calibre 9S27, an automatic movement that can also be wound manually. Grand Seiko states an approximately 50-hour power reserve for both, so the published movement and reserve do not distinguish one reference from the other.
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For the pair, the Japanese product information and the launch announcement give static accuracy of +8 to −3 seconds per day and a worn-accuracy guide of +10 to −5 seconds per day. Grand Seiko explains that static precision is measured before shipment under its movement-testing conditions; actual results when worn can vary with conditions of use. These are maker specifications, not a promise of an individual watch’s daily performance.
Grand Seiko lists 10 bar water resistance. That is a stated water-resistance rating, not evidence that either reference is a purpose-built dive watch.
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Japan launch price and present-day availability
Seiko Watch Co.’s 2025 launch announcement set a Japan-market suggested retail price of ¥880,000 including tax and a planned release date of April 25, 2025. That is launch information for Japan, not a current price quote for other countries or a statement of present availability. Retail prices, stock and authorized sellers vary by market, so check Grand Seiko or an authorized local retailer for current details. The price and launch date come from the Seiko Watch Co. announcement.
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Which reference should you choose?
- Choose STGK031 if the pink Sakura-Kakushi dial is the one you prefer.
- Choose STGK033 if you prefer the silver Sakura-Tukiyo dial and its moonlit-blossom inspiration.
- Compare locally available examples for price and stock; the shared official specifications do not make either reference a technical upgrade over the other.
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.
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