Seiko Cal. 6631 - 689

Released in 1976, the Cal. 6631 with design code 689 was part of Seiko's domestic market collection. With its 21mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-3ed1fa582e57]

Also known as: Shogun, Sea Horse

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

White

Jewels

30j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1976

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