Seiko Cal. 6636 - 331

This Automatic model from 1973 features a 41mm Hardlex-Coated Steel case. With its 19mm lug width and 14.5mm profile, it sits comfortably on most wrists. [seikata-wm-bf2f1aa5e15c]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Black

Jewels

22j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1973

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