Seiko Cal. 5641 - 639

The Seiko 5641-639 represents an important milestone in Seiko's 1972 lineup. With its 20mm lug width and 15.8mm profile, it sits comfortably on most wrists. [seikata-wm-6e6440af8e1c]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

38mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1972

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