Seiko Cal. 5639 - 831

The Seiko 5639-831 represents an important milestone in Seiko's 1975 lineup. Powered by the 5639 caliber with 28j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-a5ed237b3806]

Also known as: Silverwave, Sea Horse

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

41mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1975

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