Seiko Cal. 3878 - 631

The Seiko 3878-631 represents an important milestone in Seiko's 1985 lineup. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-a6a8550142a1]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

38mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Burgundy

Jewels

27j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1985

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