Seiko Cal. 6638 - 528

This Hand-Winding model from 1974 features a 41mm Two-Tone case. With its 22mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-b0a5bd28a1e5]

Also known as: Sumo, Pogue

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1974

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