Seiko Cal. 5631 - 211

The Seiko 5631-211 represents an important milestone in Seiko's 1988 lineup. Powered by the 5631 caliber with 21j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-4d6fb3e0b1ba]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1988

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