Seiko Cal. 4431 - 540

The Seiko 4431-540 represents an important milestone in Seiko's 1979 lineup. Powered by the 4431 caliber with 26j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-ccca153981e5]

Also known as: Bullhead, Arnie

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

35mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1979

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