Seiko Cal. 5231 - 651

The Seiko 5231-651 represents an important milestone in Seiko's 1967 lineup. It features a Navy dial protected by a Hardlex crystal and offers 100m of water resistance. [seikata-wm-3345b21c7a85]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1967

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