Seiko Cal. 4431 - 591

The 4431-591 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 4431 caliber with 33j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-fddfa4cd6ba8]

Also known as: Bullhead

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

33j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1966

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