Seiko Cal. 5638 - 852

The Seiko 5638-852 represents an important milestone in Seiko's 1967 lineup. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-b5ed22eacb03]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1967

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