Seiko Cal. 3878 - 640

The Seiko 3878-640 represents an important milestone in Seiko's 1967 lineup. Powered by the 3878 caliber with 26j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-c6515bf1fb27]

Also known as: Golden Tuna

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1967

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