Seiko Cal. 4431 - 639

The Seiko 4431-639 represents an important milestone in Seiko's 1973 lineup. With its 22mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-da8672a36362]

Also known as: Shogun, Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

34mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1973

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