Seiko Cal. 6688 - 737

The Seiko 6688-737 represents an important milestone in Seiko's 1987 lineup. With its 22mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-8b5aa451f715]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Champagne

Jewels

36j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1987

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