Seiko Cal. 6639 - 920

The Seiko 6639-920 represents an important milestone in Seiko's 1967 lineup. It features a Green dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-db2cae9cd3ae]

Also known as: Turtle

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Green

Jewels

30j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1967

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