Seiko Cal. 4430 - 631

The Seiko 4430-631 represents an important milestone in Seiko's 1978 lineup. With its 20mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-afa745e833d9]

Also known as: Sumo, Panda

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1978

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