Seiko Cal. 6398 - 640

The Seiko 6398-640 represents an important milestone in Seiko's 1967 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-fa185740ef95]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1967

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