Seiko Cal. 5640 - 780

The Seiko 5640-780 represents an important milestone in Seiko's 1971 lineup. With its 18mm lug width and 9.7mm profile, it sits comfortably on most wrists. [seikata-wm-2ead74bf842d]

Also known as: Sportsmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

34mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1971

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