Seiko Cal. 6631 - 116

The Seiko 6631-116 represents an important milestone in Seiko's 1973 lineup. With its 20mm lug width and 8.8mm profile, it sits comfortably on most wrists. [seikata-wm-458024146039]

Also known as: Monster, Bullhead

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Burgundy

Jewels

19j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1973

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