Seiko Cal. 6634 - 687

The Seiko 6634-687 represents an important milestone in Seiko's 1970 lineup. With its 18mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-9cda5a7e42c9]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1970

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