Seiko Cal. 6639 - 750

The Seiko 6639-750 represents an important milestone in Seiko's 1981 lineup. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-1b3eca8ed51a]

Also known as: Goldfeather, Crown

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1981

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