Seiko
Seiko 5 Automatic SNKN09J 43.00 mm 50 m 21 Jewels Caliber 7S26 Watch
A 43.00 mm stainless-steel automatic watch with 21 jewels, day-date display and 50 m water resistance
- StyleDress
- MaterialStainless Steel
- MovementAutomatic
- ShapeRound
- Dial ColorSilver and White
- Dial MarkersIndex
- Automatic movement runs without a battery
- 21 jewels reduce friction for smoother operation
- 50 m water resistance handles daily splashes
- 00 mm stainless steel case fits the wrist comfortably
- Mineral crystal protects the dial from scratches
Japan-made automatic dress watch
The Seiko 5 SNKN09J is a new stainless-steel timepiece built around the 7S26 automatic calibre with 21 jewels. It carries a 43.00 mm case, silver and white dial with index markers, day and date windows, and a mineral crystal. A deployment clasp secures the matching bracelet for daily wear.
Thermals noise and power draw
As a purely mechanical watch it draws no electrical power and produces no audible fan or coil noise. The movement runs from wrist motion alone, so there is no battery to replace and no charging routine. Normal office or outdoor activity keeps the mainspring wound without extra effort.
Sustained load behaviour
Continuous wear maintains the power reserve through the rotor's bidirectional winding. If left unworn the watch will stop once the stored energy is exhausted, requiring a manual wind and time reset via the pull/push crown. Water resistance is rated to 50 m for splashes and brief immersion only.
Highlights
- Automatic movement runs without a battery
- 21 jewels reduce friction for smoother operation
- 50 m water resistance handles daily splashes
- 00 mm stainless steel case fits the wrist comfortably
- Mineral crystal protects the dial from scratches
Specifications
| Brand | Seiko |
|---|---|
| Style | Dress |
| Material | Stainless Steel |
| Movement | Automatic |
| Shape | Round |
| Dial Color | Silver and White |
| Dial Markers | Index |
| Display | Analog |
| Date | Date |
| Band Material | Stainless Steel |
| Fastener | Deployment Clasp |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Back | Pull/Push Crown |
| Case Material | Stainless Steel |
| Case Thickness | 43.00 mm |
| Crystal | Mineral Crystal |
| Water-Resistant | 50m |
| Special Features | Mineral Crystal,Deployment Clasp,Day and Date Display,Pull/Push Crown |
Questions about this item
How do I set the day and date on the 7S26 movement without damaging the mechanism?
Pull the crown to the second click, advance the hands past midnight until the day and date change together, then set the correct time; avoid changing the date between 9 PM and 2 AM when the gear train is engaged.
What regular service does the automatic 21‑jewel caliber require?
A full movement clean, lubrication and seal check every three to five years keeps the 7S26 running accurately and maintains the 50 m water resistance.
Where does the 50 m water‑resistance limit show up first during daily wear?
The 50 m rating covers splashes and brief immersion only; sustained pressure from swimming or showering will breach the seals before the case or crystal fails.
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