Seiko Cal. 6378 - 686

The Seiko 6378-686 represents an important milestone in Seiko's 1974 lineup. The Coin-Edge bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-16bcf11cf684]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1974

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