Grand Seiko
Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021
“Lake Suwa”
The Grand Seiko Evolution 9 Spring Drive 5 Days (reference SLGA021) is a 40 mm stainless steel watch with a blue (Lake Suwa pattern) dial. It runs on the spring Drive caliber 9RA2 with a 120-hour power reserve and is water resistant to 100 m.
Specifications
Case
- Reference
- SLGA021
- Nickname
- Lake Suwa
- Collection
- Evolution 9
- Case size
- 40 mm
- Thickness
- 11.8 mm
- Case material
- Stainless steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 100 m
- Bracelet / strap
- Stainless steel bracelet
Dial and bezel
- Dial
- Blue (Lake Suwa pattern)
- Bezel
- Fixed
Movement
- Movement
- Spring Drive
- Caliber
- 9RA2
- Power reserve
- 120 hours
- Functions
- Date
Production
- Production
- Current
How it compares within the Evolution 9 family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| SLGA021 (This watch) | 40 mm | Stainless steel | Blue (Lake Suwa pattern) | 9RA2 | — |
| SLGA015 | 43.8 mm | High-intensity titanium | Black (Kuroshio pattern) | 9RA5 | — |
| SLGA019 | 40 mm | High-intensity titanium | Blue (Lake Suwa pattern) | 9RA2 | — |
| SLGB023 | 40.8 mm | High-intensity titanium | Blue | 9RB1 | — |
| SLGB025 | 40.8 mm | High-intensity titanium | Green | 9RB1 | — |
| SLGC001 | 43.2 mm | High-intensity titanium | Blue | 9SC5 | 2023– |
| SLGC007 | 43.2 mm | Titanium | Icy blue | 9SC5 | 2025– |
| SLGH005 | 40 mm | Stainless steel | White (White Birch pattern) | 9SA5 | 2021– |
| SLGW003 | 38.6 mm | Brilliant Hard Titanium | White (birch pattern) | 9SA4 | — |
About the Evolution 9 family
Evolution 9 is the design language Grand Seiko introduced in 2020, alongside the high-beat caliber 9SA5, as a modern development of the Grand Seiko Style: a thinner bezel, wider hour and minute hands and a lower, more comfortable case. It became a collection in its own right and now covers mechanical, Spring Drive and chronograph models.
The catalog includes references with the 9SA4 and 9SA5 mechanical calibers, the 9RA2 and 9RA5 Spring Drive calibers and the 9RB family, in steel, Ever-Brilliant Steel, high-intensity titanium and platinum. Nature-themed dials such as the white birch texture are a large part of their appeal.
Quick answers
- What size is the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021?
- The Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021 has a 40 mm case, 11.8 mm thick.
- What movement does the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021 use?
- It uses the spring drive caliber 9RA2, with a 120-hour power reserve.
- How water resistant is the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021?
- It is water resistant to 100 metres.
- Is the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021 still in production?
- Yes, it is a current reference.
- What is the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021 made of?
- The case is stainless steel. Bracelet or strap: Stainless steel bracelet.
- What is the Grand Seiko Evolution 9 Spring Drive 5 Days SLGA021 nicknamed?
- Dealers and collectors call it the “Lake Suwa”.
Catalog facts checked September 2026.