Seiko Cal. 5631 - 742

The Seiko 5631-742 represents an important milestone in Seiko's 1981 lineup. It features a Navy dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-0e414f0a0351]

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1981

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