Seiko Cal. 3878 - 636

The Seiko 3878-636 represents an important milestone in Seiko's 1970 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-777f32dd8f6c]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1970

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