Seiko Cal. 5678 - 640

The Seiko 5678-640 represents an important milestone in Seiko's 1973 lineup. It features a Navy dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-97ce030a1439]

Also known as: Tuna, World Timer

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1973

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