Seiko Cal. 6388 - 331

The Seiko 6388-331 represents an important milestone in Seiko's 1971 lineup. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-feda18873ccb]

Also known as: Bullhead, Helmet

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1971

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