Seiko Cal. 5640 - 364

This Quartz model from 1966 features a 39mm PVD Black case. With its 20mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-524e0e0cd2ab]

Also known as: Samurai

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

39mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1966

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