Seiko Cal. 5640 - 591

The Seiko 5640-591 represents an important milestone in Seiko's 1979 lineup. Powered by the 5640 caliber with 25j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-576bc08ea19e]

Also known as: Panda, Navigator

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

45mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1979

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