Grand Seiko’s Kodo “Daybreak” is reference SLGT005, a 2024 edition of 20 that pairs a platinum-and-titanium case with the brand’s caliber 9ST1 constant-force tourbillon. Grand Seiko announced an approximate U.S. recommended retail price of $395,000 at launch; that 2024 figure does not confirm today’s price or availability.
What is the Grand Seiko Kodo “Daybreak”?
“Daybreak” is the editorial name for the Grand Seiko Kodo Constant-Force Tourbillon reference SLGT005, introduced in 2024. It is the brighter counterpart to the original Kodo, SLGT003, launched in 2022. Grand Seiko frames the pair as a design story of light and shadow: the original suggests evening twilight, while SLGT005 represents daybreak. Grand Seiko’s 2024 announcement describes the new reference and its design.
The Kodo was Grand Seiko’s first mechanical complication watch. The original SLGT003 received the Chronometry Prize at the 2022 Grand Prix d’Horlogerie de Genève, according to Grand Seiko’s SLGT003 page. That award belongs to the original reference; it should not be mistaken for a separate award to SLGT005.
How does caliber 9ST1 work?
Both Kodo references use caliber 9ST1, a manually wound movement that places a tourbillon and a constant-force mechanism together on a single axis. Grand Seiko says the arrangement has no wheels or other components between the two mechanisms, allowing the constant-force mechanism to transmit torque to the balance without an intervening transmission. These are the manufacturer’s descriptions, not independent performance findings.
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- Calendar-linked time difference adjustment function
- Movement Caliber 9S86,
- Dual-curved sapphire crystal
Grand Seiko says the outer constant-force carriage advances once per second around the inner rotating tourbillon carriage. In SLGT005, silver-toned components and pale blue sapphire jewels distinguish the mechanism’s brighter presentation.
Power reserve and testing
Grand Seiko states a 72-hour power reserve for the movement and says the constant-force portion operates for approximately 50 hours. The two figures describe different aspects of the system: the first is the stated movement reserve, while the second is the manufacturer’s stated operating duration for the constant-force mechanism. The brand also says each movement is tested for 48 hours in six positions and at three temperatures, and assessed over 34 days. These figures are from Grand Seiko’s 2024 release, not an independent test report.
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- See-through case back
- Date display
- Screw-down crown
- 40mm Diameter
- Weight 178.0 g
Case, dial and included straps
The case combines an inner shell of 950 platinum with an outer case of Brilliant Hard Titanium. Grand Seiko describes hand-finished surfaces that include Zaratsu polishing and hairline finishing. The published dimensions are 43.8 mm in diameter and 12.9 mm thick; the stated ratings are 10 bar water resistance and 4,800 A/m magnetic resistance.
The open-worked dial and transparent caseback leave the layered movement visible. Grand Seiko says the design uses empty space and light entering from both sides, with the pale blue movement jewels adding a dawn-like accent. Those are the maker’s stated design intentions.
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- Three-fold clasp with push button release
- Dual-curved sapphire crystal
- Power reserve display on the back
- Power resrve Approx. 72 hours(3 days)
SLGT005 was announced with two straps: white leather treated and coated with white urushi lacquer, and charcoal-grey crocodile leather. The release does not establish separate current availability for either strap.
SLGT005 compared with the original SLGT003
| Detail | SLGT005 “Daybreak” | SLGT003 original Kodo |
|---|---|---|
| Release year | 2024, according to Grand Seiko’s 2024 release. | 2022, according to Grand Seiko’s official product page. |
| Design treatment | Daybreak; brighter silver-toned components and pale blue sapphire jewels, per the 2024 release. | Twilight, the evening counterpart in Grand Seiko’s design story, per the 2024 release. |
| Movement | Caliber 9ST1, manual winding; integrated constant-force mechanism and tourbillon, per the 2024 release. | Caliber 9ST1, as listed on Grand Seiko’s SLGT003 page. |
| Edition and dated price | 20 pieces; approximately $395,000 U.S. recommended retail price at the 2024 announcement. Price and specifications were stated as of publication and subject to change, per the release. | Edition size and original launch price are not stated in the cited official product page. The current U.S. boutique page lists $350,000 and says to inquire about availability; that is a distinct SLGT003 listing, not the price of SLGT005. |
| Current availability | Not established. Grand Seiko said boutiques would begin offering it in December 2024; that launch schedule does not show present stock. | The U.S. boutique page says to inquire about availability; it does not confirm stock. |
Price, edition and availability
Grand Seiko’s 2024 release describes SLGT005 as a 20-piece edition and gives an approximate U.S. recommended retail price of $395,000. It said the watch would be available at Grand Seiko boutiques beginning in December 2024 and noted that price and specifications were as of publication and subject to change. The release does not establish the watch’s current stock status or current market-specific price.
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Grand Seiko’s U.S. boutique listing for the separate SLGT003 shows $350,000 and invites customers to inquire about availability. That listing is not a current price reference for SLGT005. For either reference, a dated announcement or page listing is not confirmation that a watch is presently available.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who is the Daybreak for?
SLGT005 is most compelling to a collector drawn to visible mechanical architecture and the unusual combination of a tourbillon with a constant-force mechanism. Its limited 20-piece production and platinum/titanium construction place it firmly in the high-complication, high-luxury category. The practical decision points are whether the larger 43.8 mm case suits the wearer, whether the open movement and bright palette appeal more than SLGT003’s twilight treatment, and whether a specific piece can actually be sourced at an acceptable current price.
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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.
