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Round stainless steel watch with blue dial and metal bracelet

Seiko

Seiko 5 Automatic 21 Jewels Blue Dial SNK603K1 38mm Watch

SKU CH-TZQ4-YC1V7

Automatic 21-jewel movement with day-date display, 38 mm stainless-steel case and 30 m water resistance

  • Watch movementAutomatic
  • Product shapeRound
  • Watch face colorSilver
  • Dial markingsIndex
  • Display typeAnalog
  • Date displayDate
  • 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.

How it compares

Measured against everything we stock in Analog & Digital Wristwatches, at today’s prices. Recalculated every night.

Price $153.99
Pricier than about 57% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameSeiko
Design styleDress
Watch face colorSilver
Item conditionNew
Display
Display typeAnalog
Size & build
Main materialStainless Steel
Product shapeRound
Strap materialStainless Steel
Closure typeDeployment Clasp
Bezel typeFixed Bezel
Housing materialStainless Steel
Case size38 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance30m
More details
Watch movementAutomatic
Dial markingsIndex
Date displayDate
Suitable forMale

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.

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