Seiko Cal. 4431 - 803

The Seiko 4431-803 represents an important milestone in Seiko's 1967 lineup. With its 21mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-8d23276adeaa]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1967

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