Seiko Cal. 5640 - 439

The Seiko 5640-439 represents an important milestone in Seiko's 1965 lineup. It features a Black dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-1dfcba2728a4]

Also known as: Sea Horse, Emperor

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

35mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1965

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