Seiko Cal. 6631 - 907

The Seiko 6631-907 represents an important milestone in Seiko's 1976 lineup. With its 18mm lug width and 13.5mm profile, it sits comfortably on most wrists. [seikata-wm-eec628289de6]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

13.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Champagne

Jewels

29j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1976

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