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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 →Repair Windows errors before they cause bigger problemsFix Now →The Grand Seiko SBGA507 is a U.S.-exclusive limited edition of 300, with a kirazuri-inspired blue dial and the brand’s 44GS case design. SBGA509 is also listed by Grand Seiko as a limited 44GS model, and both references appear at a displayed U.S. price of $5,600. The available official listings provide far more model-specific detail for SBGA507, so the two watches should not be treated as identical beyond what those listings confirm.
What is the difference between the Grand Seiko SBGA507 and SBGA509?
Grand Seiko lists both references in its 44GS lineup and in its Caliber 9R65 model listing. Its official U.S. listings show a price of $5,600 for each. The clearest documented differences are in what the brand publishes: SBGA507 has a dedicated product description and specifications, while the consulted listings do not establish SBGA509’s dial story, edition quantity, or full measurements.
| Detail | SBGA507 | SBGA509 |
|---|---|---|
| U.S. displayed price | $5,600 on Grand Seiko’s U.S. product page (official listing) | $5,600 on Grand Seiko’s Caliber 9R65 listing (official listing) |
| Limited-edition status | U.S.-exclusive limited edition of 300 pieces, according to its product page | Listed as a limited model; edition quantity not stated in the consulted official listings |
| Case lineage | 44GS design | Listed in the 44GS collection |
| Movement association | Caliber 9R65 Spring Drive; full specifications are on the product page | Appears in Grand Seiko’s Caliber 9R65 model listing; the consulted listing does not provide a full SBGA509 specification sheet |
| Dial description | Blue dial described as inspired by kirazuri and the early-evening sky over Lake Suwa | Not established by the consulted model-specific information |
| Full dimensions and other specifications | Published on the product page; details below | Not established by the consulted model-specific information |
The comparison reflects the information in Grand Seiko’s 44GS collection listing and Caliber 9R65 listing. A shared collection or caliber listing is not proof that the references share every design detail or specification.
Is the Grand Seiko SBGA507 a U.S. exclusive, and how many were made?
Yes. Grand Seiko describes SBGA507 as a U.S.-exclusive limited edition and specifies an edition of 300 pieces on its U.S. product page. That quantity applies to SBGA507; the consulted official listings do not state how many SBGA509 watches were made.
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What is the SBGA507 dial inspired by?
Grand Seiko says the 2024 SBGA507 revisits kirazuri, a decorative use of mica powder associated with ukiyo-e woodblock prints. The brand describes the cool blue dial as evoking the early-evening sky over Lake Suwa. This is the manufacturer’s design description, not a documented dial description for SBGA509.
What does the 44GS design mean?
Grand Seiko dates the original 44GS to 1967 and says it defined the Grand Seiko Style. The brand’s 44GS collection page describes the design through mirror-polished surfaces, sharp ridgelines, and the interplay of light and shadow. Both SBGA507 and SBGA509 appear in that collection.
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SBGA507 specifications
Grand Seiko’s official SBGA507 product page gives the following specifications:
| Specification | SBGA507 |
|---|---|
| Case and bracelet | Stainless steel |
| Case diameter | 40.0 mm |
| Lug-to-lug length | 46.2 mm |
| Thickness | 12.5 mm |
| Band width | 19 mm |
| Crystal | Dual-curved sapphire with anti-reflective coating on the inner surface |
| Case back | See-through screw case back |
| Clasp | Folding clasp with push-button release |
| Water resistance | 10 bar |
| Magnetic resistance | 4,800 A/m |
| Crown | Screw-down |
These figures are manufacturer-published specifications for SBGA507. They should not be assumed to describe SBGA509 without an SBGA509-specific specification source.
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What movement is in the Grand Seiko SBGA507?
SBGA507 uses Grand Seiko Caliber 9R65, a Spring Drive movement with automatic and manual winding. Grand Seiko states approximately 72 hours (three days) of power reserve and accuracy of ±15 seconds per month (±1 second per day). The product page also lists 30 jewels and a power-reserve indicator.
Grand Seiko describes Spring Drive as spring-powered: the mainspring drives the gears, while a rotor generates a small electrical charge that activates an electronic circuit and quartz oscillator to regulate the movement. The brand says the system uses no battery or external power source. The 9R65 listing associates SBGA509 with the caliber, but the consulted sources do not provide a complete SBGA509 specification sheet.
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Price and availability
Grand Seiko’s U.S. SBGA507 product page and its 9R65 listing display $5,600 for SBGA507 and SBGA509, respectively. These are listed brand prices, not verified transaction prices. The product page offers boutique-online and store-search routes, but the listings do not establish current stock at a particular boutique or retailer. Check Grand Seiko’s current listings or contact a seller for live 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.
