Seiko Cal. 5631 - 904

Released in 1989, the Cal. 5631 with design code 904 was part of Seiko's domestic market collection. It features a White dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-cc76fb87e4eb]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

White

Jewels

35j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1989

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