Seiko Cal. 6639 - 457

The Seiko 6639-457 represents an important milestone in Seiko's 1983 lineup. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-c6bb9bd44a4d]

Also known as: Sumo, Goldfeather

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1983

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