Seiko Cal. 4431 - 975

The 4431-975 is a sought-after Kinetic piece from Seiko's golden era. With its 21mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-e9ad3abe0b9b]

Also known as: Bullhead

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

25j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1979

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