Seiko Cal. 5668 - 648

The Seiko 5668-648 represents an important milestone in Seiko's 1971 lineup. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-a4c7cefb5a2b]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

10.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1971

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