Seiko Cal. 5640 - 868

The Seiko 5640-868 represents an important milestone in Seiko's 1968 lineup. It features a Navy dial protected by a Sapphire crystal and offers 160m of water resistance. [seikata-wm-b1c21407830a]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

22j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1968

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