Seiko Cal. 5640 - 398

The Seiko 5640-398 represents an important milestone in Seiko's 1988 lineup. Powered by the 5640 caliber with 19j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-dfaea34b5706]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

44mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

Burgundy

Jewels

19j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1988

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