Seiko Cal. 5640 - 638

The Seiko 5640-638 represents an important milestone in Seiko's 1967 lineup. It features a Burgundy dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-0862f1ff0f86]

Also known as: Navigator, Sea Horse

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

46mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Burgundy

Jewels

28j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1967

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