Seiko Cal. 3878 - 640

The Seiko 3878-640 represents an important milestone in Seiko's 1976 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-6b967a1fb3a6]

Also known as: Tuna, Navigator

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

10.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Champagne

Jewels

35j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1976

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