Seiko Cal. 6631 - 857

The Seiko 6631-857 represents an important milestone in Seiko's 1999 lineup. With its 19mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-d2a0bc5c05d9]

Also known as: Bullhead, Helmet

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

45mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

33j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1999

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