Seiko Cal. 5639 - 308

The Seiko 5639-308 represents an important milestone in Seiko's 1975 lineup. With its 18mm lug width and 12.6mm profile, it sits comfortably on most wrists. [seikata-wm-83499c44fa49]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1975

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