Seiko Cal. 5638 - 670

The Seiko 5638-670 represents an important milestone in Seiko's 1968 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-049498122e4c]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Champagne

Jewels

18j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1968

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