Seiko Cal. 5640 - 155

The Seiko 5640-155 represents an important milestone in Seiko's 1982 lineup. With its 22mm lug width and 13.7mm profile, it sits comfortably on most wrists. [seikata-wm-6466ab18e8a5]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Champagne

Jewels

19j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1982

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