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Round stainless steel watch with blue dial and bracelet, 37.40 mm case

Seiko

Seiko 5 Sports Blue Dial Automatic 100M SRPK87K1 watch

SKU CH-7WSB-V096J

Stainless-steel automatic sports watch with a blue dial, day-date display and 100 m water resistance

  • StyleSports
  • MaterialStainless Steel
  • MovementAutomatic
  • ShapeRound
  • Dial ColorBlue
  • Dial MarkersIndex
  • Automatic 4R36 movement with 24 jewels powers the watch
  • 100 m water resistance suits swimming and snorkelling
  • Blue dial with day and date display adds everyday utility
  • Stainless steel case and bracelet with deployment clasp ensure durability
  • Curved Hardlex crystal protects the dial from scratches

Seiko 5 Sports Automatic Watch

The Seiko 5 Sports SRPK87K1 is a stainless steel automatic watch built for daily wear and water exposure up to 100 metres. Its 4R36 calibre with 24 jewels powers hour, minute, second, day and date functions without a battery. The 37.40 mm case fits a wide range of wrist sizes for comfortable all-day use.

Upgrade from Quartz or Entry Models

This mechanical timepiece replaces battery-driven quartz watches that require periodic cell changes. The automatic movement winds from natural wrist motion, removing the need for manual winding if worn regularly. The jump is worth it for buyers who value traditional watchmaking and a self-sustaining movement over disposable electronics.

Sustained Daily Wear Behaviour

Under continuous wear the rotor keeps the mainspring charged, delivering consistent timekeeping through active days and nights. The Hardlex crystal resists everyday knocks while the fixed bezel and screw-down crown maintain the 100 metre water resistance. The deployment clasp secures the bracelet during prolonged activity without loosening.

Highlights

  • Automatic 4R36 movement with 24 jewels powers the watch
  • 100 m water resistance suits swimming and snorkelling
  • Blue dial with day and date display adds everyday utility
  • Stainless steel case and bracelet with deployment clasp ensure durability
  • Curved Hardlex crystal protects the dial from scratches

Specifications

BrandSeiko
StyleSports
MaterialStainless Steel
MovementAutomatic
ShapeRound
Dial ColorBlue
Dial MarkersIndex
DisplayAnalog
DateDate
Band MaterialStainless Steel
FastenerDeployment Clasp
GenderMale
ConditionNew
BezelFixed Bezel
Case MaterialStainless Steel
Case Thickness37.40 mm
CrystalHardlex Crystal
Water-Resistant100m
Special FeaturesHardlex Crystal,Deployment Clasp,Day and Date Display

Questions about this item

What case thickness and crystal type should I allow for when sizing a watch winder slot?

The case measures 37.40 mm thick and is covered by a curved Hardlex crystal, so the winder cushion must clear at least that height.

How do I set the day and date on the 4R36 movement without damaging the mechanism?

Pull the crown to the first click for date, second click for day; avoid changing between 9 PM and 2 AM when the gears are engaged.

Which service items does the 24‑jewel 4R36 caliber typically need during a routine overhaul?

A standard service replaces mainspring, gaskets, and lubricates the 24 jewel points; the Hardlex crystal and deployment clasp are inspected for wear.

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