Seiko Cal. 6637 - 451

The Seiko 6637-451 represents an important milestone in Seiko's 1992 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-4383f3f19888]

Also known as: Helmet, Emperor

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

42mm

Case Thickness

14.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Champagne

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1992

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