Seiko Cal. 5639 - 374

The Seiko 5639-374 represents an important milestone in Seiko's 1968 lineup. With its 21mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-04e943bc1bd0]

Also known as: Silverwave, Baby Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1968

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