Seiko Cal. 5664 - 721

The Seiko 5664-721 represents an important milestone in Seiko's 1976 lineup. With its 21mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-7d98805cc852]

Also known as: Sumo, Crown

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

15.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1976

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