Seiko
Seiko 5 SNK381K1 Automatic 21 Jewel Black Dial Day/Date 37mm 30M Watch
Automatic 21-jewel movement with day-date display in a 37 mm stainless steel case rated to 30 m water resistance
- StyleDress
- MaterialStainless Steel
- MovementAutomatic
- ShapeRound
- Dial ColorBlack
- Dial MarkersNumbers
- Automatic Caliber 7S26 movement runs without a battery
- 21-jewel construction reduces friction for reliable timekeeping
- Day and date display at 3 o'clock for quick reference
- Stainless steel case and bracelet with 30 m water resistance
- Transparent case back reveals the mechanical movement
Everyday Automatic 37mm
This stainless steel watch runs on the Caliber 7S26 automatic movement with 21 jewels and a 40-hour power reserve. The black dial shows Arabic numerals, luminous hands and a day-date window at 3 o'clock. A see-through case back reveals the movement. Water resistance is rated at 30 meters for daily splashes.
Fixed Bezel Hardlex Crystal
The 38 mm round case uses a fixed bezel and a scratch-resistant Hardlex crystal to protect the dial. Crown operation is pull or push, keeping the slim 11 mm profile practical for shirt cuffs. No battery changes are needed thanks to the self-winding mechanism. The 30 m rating covers rain and hand-washing only.
17mm Bracelet Double Push Clasp
The matching stainless steel bracelet measures 17 mm wide and secures with a fold-over clasp featuring a double push-button release. This design stays locked during active movement yet opens easily with one hand. The solid links and fixed bezel suit office and casual wear alike. Swimmers and divers should choose a higher water-resistance model.
Highlights
- Automatic Caliber 7S26 movement runs without a battery
- 21-jewel construction reduces friction for reliable timekeeping
- Day and date display at 3 o'clock for quick reference
- Stainless steel case and bracelet with 30 m water resistance
- Transparent case back reveals the mechanical movement
Specifications
| Brand | Seiko |
|---|---|
| Style | Dress |
| Material | Stainless Steel |
| Movement | Automatic |
| Shape | Round |
| Dial Color | Black |
| Dial Markers | Numbers |
| Display | Analog |
| Band Material | Stainless Steel |
| Fastener | Fold Over Clasp With Double Push Button |
| Gender | Male |
| Age | Adult |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Material | Stainless Steel |
| Case Thickness | 37.00 mm |
| Water-Resistant | 30m |
| Special Features | ,Fold Over Clasp With Double Push Button,Day and Date Display |
Questions about this item
How do I set the day and date on the Caliber 7S26 without damaging the movement?
Pull the crown to the first position to change the date and day separately; avoid adjusting between 9 PM and 3 AM when the date mechanism is engaged.
What regular service does the 21‑jewel automatic movement require?
A professional clean, lubrication and seal check every three to five years keeps the 7S26 running accurately and maintains the 30 m water resistance.
At what depth does the 30 m rating become unreliable during continuous activity?
The 30 m rating covers splashes and brief immersion only; sustained swimming or diving will exceed the seal limits and risk water ingress.
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