Seiko Cal. 6668 - 613

The Seiko 6668-613 represents an important milestone in Seiko's 1971 lineup. With its 22mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-4c8c02aa85fc]

Also known as: Monster, Bellmatic

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

38mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1971

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