Seiko Cal. 5640 - 318

The Seiko 5640-318 represents an important milestone in Seiko's 1987 lineup. With its 21mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-98fcbc2ad262]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

35mm

Case Thickness

9.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Champagne

Jewels

35j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1987

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