Seiko Cal. 5631 - 650

The Seiko 5631-650 represents an important milestone in Seiko's 1966 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-9c3c8b96cf81]

Also known as: Sea Horse, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1966

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