Seiko Cal. 5640 - 289

Released in 1976, the Cal. 5640 with design code 289 was part of Seiko's domestic market collection. With its 20mm lug width and 14.4mm profile, it sits comfortably on most wrists. [seikata-wm-578dbb65ab8d]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1976

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