Seiko Cal. 4590 - 991

The Seiko 4590-991 represents an important milestone in Seiko's 1981 lineup. Powered by the 4590 caliber with 22j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-3aa6eb854faa]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

130m

Dial Color

Silver

Jewels

22j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1981

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