Seiko Cal. 6636 - 677

This Spring Drive model from 1979 features a 41mm Two-Tone case. With its 21mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-4da68e9024c2]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

23j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1979

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