Seiko Cal. 5631 - 357

The Seiko 5631-357 represents an important milestone in Seiko's 1991 lineup. The Fixed bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-bcdca66f50f8]

Also known as: Rally, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1991

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