Seiko Cal. 6631 - 556

Released in 1988, the Cal. 6631 with design code 556 was part of Seiko's domestic market collection. With its 22mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-779bcb76dd4e]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Cream

Jewels

27j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1988

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