Seiko
Seiko 5 Automatic 21 Jewels Blue Dial SNK603K1 38mm Watch
Automatic 21-jewel movement with day-date display, 38 mm stainless-steel case and 30 m water resistance
- StyleDress
- MaterialStainless Steel
- MovementAutomatic
- ShapeRound
- Dial ColorSilver
- Dial MarkersIndex
- Automatic Caliber 7S26 movement powers the watch without a battery
- 21 jewels reduce friction for smoother long-term operation
- Blue dial with day and date display adds everyday utility
- 38 mm stainless steel case with see-through case back shows the mechanism
- 30 m water resistance handles splashes and brief immersion
A 38 mm dress watch with automatic movement
The Seiko 5 SNK603K1 is a round stainless-steel watch powered by the 21-jewel Caliber 7S26 automatic movement. A silver dial with index markers sits under mineral crystal and shows day and date windows. The integrated bracelet fastens with a deployment clasp, and water resistance is rated to 30 metres.
Suits buyers who want a compact mechanical daily
This model fits wrists that prefer a 38 mm case and a thickness of 11 mm. It does not satisfy buyers who need a screw-down crown or water resistance beyond 30 metres. It also does not meet the needs of anyone requiring a chronograph, a rotating bezel or a sapphire crystal.
The 38 mm case diameter decides fit
A 38 mm diameter with an 11 mm profile determines whether the watch sits proportionately on a given wrist. Buyers should measure their wrist and compare it to these dimensions before purchasing. No other specification overrides this physical constraint.
Highlights
- Automatic Caliber 7S26 movement powers the watch without a battery
- 21 jewels reduce friction for smoother long-term operation
- Blue dial with day and date display adds everyday utility
- 38 mm stainless steel case with see-through case back shows the mechanism
- 30 m water resistance handles splashes and brief immersion
Specifications
| Brand | Seiko |
|---|---|
| Style | Dress |
| Material | Stainless Steel |
| Movement | Automatic |
| Shape | Round |
| Dial Color | Silver |
| Dial Markers | Index |
| Display | Analog |
| Date | Date |
| Band Material | Stainless Steel |
| Fastener | Deployment Clasp |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Material | Stainless Steel |
| Case Thickness | 38.00 mm |
| Crystal | Mineral Crystal |
| Water-Resistant | 30m |
| Special Features | Mineral Crystal,Deployment Clasp,Day and Date Display |
Questions about this item
How do I set the day and date on the 7S26 movement without damaging it?
Pull the crown to the first click to change the date, then to the second click for the day; avoid adjusting between 9 PM and 3 AM when the calendar mechanism is engaged.
What service interval does the 21‑jewel automatic calibre require?
Seiko recommends a full movement service every three to five years to replace lubricants, check the mainspring and reseal the 30 m water‑resistance.
Where does the 30 m water‑resistance limit show up first in daily wear?
The 30 m rating only protects against splashes and rain; submerging the watch while washing hands or swimming will breach the seals and allow moisture into the case.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
