Seiko Cal. 0721 - 639

The Seiko 0721-639 represents an important milestone in Seiko's 1980 lineup. It features a Black dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-6acf422f105d]

Also known as: Turtle, Silverwave

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1980

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