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Grand Seiko’s SBGH311 and SBGR325 are 37 mm limited editions announced in January 2023 to mark 25 years of its Caliber 9S mechanical movement series. They share a steel case and bracelet, but differ in movement, dial, beat rate and power reserve: the SBGH311 has a high-beat 9S85 with a 55-hour reserve, while the SBGR325’s 9S65 is specified for 72 hours.
How the SBGH311 and SBGR325 differ
| Specification | Grand Seiko SBGH311 | Grand Seiko SBGR325 |
|---|---|---|
| Movement | Automatic Caliber 9S85 | Automatic Caliber 9S65 |
| Beat rate | 36,000 vibrations per hour | 28,800 vibrations per hour |
| Power reserve | 55 hours | 72 hours |
| Jewels | 37 | 35 |
| Dial | Blue; inspired by a “cloud sea” over Mt. Iwate | Silver; inspired by the sky at its zenith over Mt. Iwate |
| Case diameter and thickness | 37.0 mm; 13.3 mm | 37.0 mm; 13.3 mm |
| Announced limited quantity | 1,200 pieces | 1,200 pieces |
| Approximate U.S. recommended retail price at January 2023 announcement | $6,600 | $5,300 |
Specifications and launch figures are from Grand Seiko’s January 10, 2023 announcement. The prices are historical U.S. launch recommendations, not current price guidance.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Grand Seiko Stainless Steel 40mm White Birch Dial Series 9 Watch SLGH005 | $9,300.00 | Buy on Amazon |
| 2 |
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Grand Seiko Lake Suwa Omiwatari Elegance Watch SBGY007 | $8,750.00 | Buy on Amazon |
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Grand Seiko Elegance GMT Shosho Summer Dial Watch SBGJ249 | $7,500.00 | Buy on Amazon |
Movement: higher beat rate or longer reserve?
SBGH311: Caliber 9S85
The SBGH311’s automatic 9S85 runs at 36,000 vibrations per hour and has a stated 55-hour power reserve. Grand Seiko lists 37 jewels and a mean daily rate of +5 to -3 seconds.
SBGR325: Caliber 9S65
The SBGR325’s automatic 9S65 runs at 28,800 vibrations per hour and has a stated 72-hour power reserve. It has 35 jewels, with the same stated mean daily rate of +5 to -3 seconds.
#1 Best Overall
- See-through case back
- Date display
- Screw-down crown
- 40mm Diameter
- Weight 178.0 g
These figures describe the movements’ published specifications. The higher beat rate does not, by itself, establish better real-world accuracy, and the longer reserve does not establish how a particular watch will perform in use.
Shared case and practical specifications
Both references use a 37.0 mm stainless-steel case, 13.3 mm thick, with a matching steel bracelet. Each has a dual-curved sapphire crystal with anti-reflective coating, 10-bar water resistance and 4,800 A/m magnetic resistance. The shared dimensions and construction make the decision less about case size and more about dial preference and movement priorities.
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)
Two dials inspired by Mt. Iwate skies
Grand Seiko connected both designs to the changing sky above Mt. Iwate, near Grand Seiko Studio Shizukuishi. The SBGH311’s blue dial evokes a “cloud sea”; the SBGR325’s silver dial represents the sky at its zenith. The company described them as “unique interpretations of the changing sky above Mt. Iwate, where the Grand Seiko Studio Shizukuishi is located.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which reference fits your priorities?
- Choose the SBGH311 if you prefer the blue cloud-sea dial and want the higher-frequency 9S85 movement. Its stated reserve is 55 hours.
- Choose the SBGR325 if you prefer the silver dial and value the longer stated reserve. Its 9S65 is specified for 72 hours.
The announcement does not establish current stock, resale value or street prices, so the launch prices should not be used as a guide to what either watch costs today.
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Rank #3
- 24-hour hand (dual time display function)
- Power Reserve Approx. 55 hours
- See-through case back
Anniversary, quantity and launch availability
Grand Seiko presented the pair in January 2023 as limited editions celebrating 25 years of the Caliber 9S mechanical series, with 1,200 pieces announced for each reference. The company planned boutique and select retail-partner availability from April 2023; that was the original launch plan, not confirmation of present availability.
Quick Recap
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.
