Seiko Cal. 6645 - 539

This Spring Drive model from 1976 features a 40mm Titanium case. With its 19mm lug width and 11.0mm profile, it sits comfortably on most wrists. [seikata-wm-eee134c11a92]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Champagne

Jewels

26j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1976

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