Seiko Cal. 6634 - 378

The Seiko 6634-378 represents an important milestone in Seiko's 1974 lineup. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-e2a17083726b]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

39mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1974

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