Seiko Cal. 5638 - 876

The Seiko 5638-876 represents an important milestone in Seiko's 1979 lineup. With its 22mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-db92b7fcd2dc]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Green

Jewels

27j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1979

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