Seiko Cal. 3870 - 313

The Seiko 3870-313 represents an important milestone in Seiko's 1981 lineup. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-01be91c2d7b2]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

White

Jewels

31j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1981

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