Seiko Cal. 3816 - 731

This Hand-Winding model from 1990 features a 36mm Hardlex-Coated Steel case. With its 18mm lug width and 12.2mm profile, it sits comfortably on most wrists. [seikata-wm-d8560ccbeedd]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

27j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1990

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