Seiko Cal. 6631 - 474

The Seiko 6631-474 represents an important milestone in Seiko's 1972 lineup. With its 18mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-57a7d7040694]

Also known as: Tuna, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

24j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1972

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