Seiko Cal. 5639 - 315

The Seiko 5639-315 represents an important milestone in Seiko's 1972 lineup. The Coin-Edge bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-71c4c6452324]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

37mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1972

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