Seiko Cal. 5631 - 651

Released in 1983, the Cal. 5631 with design code 651 was part of Seiko's domestic market collection. With its 21mm lug width and 9.8mm profile, it sits comfortably on most wrists. [seikata-wm-60bb0ee91176]

Also known as: Tuna, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1983

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