Seiko Cal. 5640 - 538

The Seiko 5640-538 represents an important milestone in Seiko's 1982 lineup. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-4a50615ec5d8]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

38mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1982

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