Seiko
Seiko 5 Sports SRPJ81K1 Automatic Watch 36.40 mm 100m
Automatic sports watch with a 36.40 mm stainless steel case, black dial, day-date display and 100 m water resistance
- StyleSports
- MaterialStainless Steel
- MovementAutomatic
- ShapeRound
- Dial ColorBlack
- Dial MarkersNumbers
- Automatic 4R36 movement with 24 jewels powers the watch
- 100 m water resistance suits swimming and snorkelling
- Curved Hardlex crystal protects the black dial
- Stainless steel case and bracelet resist daily wear
- Day and date display adds practical convenience
Seiko 5 Sports 36.40 mm Automatic Watch
The Seiko 5 Sports SRPJ81K1 is a 36.40 mm stainless steel wristwatch driven by the automatic 4R36 calibre with 24 jewels. A black dial with applied numbers and a day-date window sits beneath a curved Hardlex crystal. The matching stainless steel bracelet secures with a deployment clasp for a firm fit. Water resistance is rated to 100 metres.
Suits daily wear and light aquatic activity
Buyers who want a compact automatic watch with a steel bracelet and 100 metre water resistance will find the 36.40 mm case comfortable for all-day use. The Hardlex crystal and deployment clasp add practical durability for office or weekend settings. Those needing a larger case diameter, a screw-down crown, or ISO dive certification should consider other models.
Caliber 4R36 with 24 jewels decides fit
The 4R36 automatic movement provides hand-winding and hacking seconds without a battery. Its 24-jewel construction supports reliable timekeeping for everyday wear. If the buyer requires a movement with a longer power reserve, higher beat rate, or chronometer certification, this calibre will not meet that requirement.
Highlights
- Automatic 4R36 movement with 24 jewels powers the watch
- 100 m water resistance suits swimming and snorkelling
- Curved Hardlex crystal protects the black dial
- Stainless steel case and bracelet resist daily wear
- Day and date display adds practical convenience
Specifications
| Brand | Seiko |
|---|---|
| Style | Sports |
| Material | Stainless Steel |
| Movement | Automatic |
| Shape | Round |
| Dial Color | Black |
| Dial Markers | Numbers |
| Display | Analog |
| Date | Date |
| Band Material | Stainless Steel |
| Fastener | Deployment Clasp |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Back | Pull Out Crown |
| Case Material | Stainless Steel |
| Case Thickness | 36.40 mm |
| Crystal | Hardlex Crystal |
| Water-Resistant | 100m |
| Special Features | Hardlex Crystal,Deployment Clasp,Day and Date Display,Pull Out Crown |
Questions about this item
Will the 36.40 mm case and stainless-steel bracelet sit comfortably alongside my older 36 mm Seiko 5 on the same wrist?
The 36.40 mm case is only fractionally wider than a classic 36 mm case, and the matching stainless-steel bracelet with deployment clasp shares the same lug width, so both watches wear very similarly on the same wrist.
How can I verify the Caliber 4R36 automatic movement is running correctly after I set it up?
Wind the pull-out crown until you feel resistance, set the time and day-date, then confirm the seconds hand moves in a smooth sweep and the day-date window advances cleanly at midnight.
Does the box include the curved Hardlex crystal and 100 m water resistance, or must I purchase any protection separately?
The watch ships with the curved Hardlex crystal already fitted and is rated to 100 m water resistance; no extra crystal or seal kit is required.
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