Seiko Cal. 6378 - 604

The Seiko 6378-604 represents an important milestone in Seiko's 1979 lineup. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-65e6d6ef0920]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1979

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