Seiko Cal. 5639 - 252

The Seiko 5639-252 represents an important milestone in Seiko's 1970 lineup. With its 19mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-46b8db84b3ec]

Also known as: Sumo, Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1970

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