Seiko Cal. 6631 - 481

The Seiko 6631-481 represents an important milestone in Seiko's 1980 lineup. With its 21mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-9529f403dfba]

Also known as: Bellmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Cream

Jewels

22j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1980

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