Grand Seiko
Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375
The Grand Seiko Heritage Spring Drive 40 (44GS) (reference SBGA375) is a 40 mm stainless steel watch with a midnight blue dial. It runs on the spring Drive caliber 9R65 with a 72-hour power reserve and is water resistant to 100 m.
Specifications
Case
- Reference
- SBGA375
- Collection
- Heritage
- Case size
- 40 mm
- Thickness
- 12.5 mm
- Case material
- Stainless steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 100 m
- Bracelet / strap
- Stainless steel bracelet
Dial and bezel
- Dial
- Midnight blue
- Bezel
- Fixed
Movement
- Movement
- Spring Drive
- Caliber
- 9R65
- Power reserve
- 72 hours
- Jewels
- 30
- Functions
- Date, Power reserve indicator
Production
- Production
- Current
How it compares within the Heritage family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| SBGA375 (This watch) | 40 mm | Stainless steel | Midnight blue | 9R65 | — |
| SBGA211 | 41 mm | High-intensity titanium | White Snowflake pattern | 9R65 | 2017– |
| SBGA413 | 40 mm | High-intensity titanium | Pink (Shunbun / hana-ikada) | 9R65 | 2020– |
| SBGH351 | 40 mm | Ever-Brilliant Steel | Green | 9S85 | 2025– |
| SBGH353 | 40 mm | Ever-Brilliant Steel | Silver | 9S85 | 2025– |
| SBGH368 | 38 mm | 18k rose gold | Silver | 9S85 | 2025– |
| SLGW007 | 38.6 mm | Stainless steel | Navy | 9SA4 | 2025– |
| STGK031 | 30 mm | Stainless steel | Light pink | 9S27 | 2025– |
| STGK033 | 30 mm | Stainless steel | Silver | 9S27 | 2025– |
About the Heritage family
Heritage is Grand Seiko's collection rooted in its classic 1960s designs, especially the 44GS and 62GS. It keeps the sharp facets, flat polished surfaces and clean dials of the Grand Seiko Style, in a wide range of sizes and movements.
The catalog includes mechanical models with 9S and 9SA calibers, Spring Drive with 9R and 9RA calibers, and quartz with the 9F, in steel, Ever-Brilliant Steel, high-intensity titanium and gold. With so many dial variations and limited editions, confirm the exact reference, and check the case edges for polishing.
Quick answers
- What size is the Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375?
- The Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375 has a 40 mm case, 12.5 mm thick.
- What movement does the Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375 use?
- It uses the spring drive caliber 9R65, with a 72-hour power reserve.
- How water resistant is the Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375?
- It is water resistant to 100 metres.
- Is the Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375 still in production?
- Yes, it is a current reference.
- What is the Grand Seiko Heritage Spring Drive 40 (44GS) SBGA375 made of?
- The case is stainless steel. Bracelet or strap: Stainless steel bracelet.
Catalog facts checked September 2026.