Seiko Cal. 3870 - 103

The Seiko 3870-103 represents an important milestone in Seiko's 1978 lineup. The Inner Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-9d7112a418c6]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1978

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