Seiko Cal. 6637 - 677

The Seiko 6637-677 represents an important milestone in Seiko's 1991 lineup. With its 22mm lug width and 13.8mm profile, it sits comfortably on most wrists. [seikata-wm-ea10995ca7a4]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1991

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