Seiko Cal. 6638 - 578

The Seiko 6638-578 represents an important milestone in Seiko's 1971 lineup. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-c1c06bbad2ff]

Also known as: Samurai, Baby Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

100m

Dial Color

Burgundy

Jewels

34j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1971

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