Seiko Cal. 6639 - 521

The Seiko 6639-521 represents an important milestone in Seiko's 1984 lineup. The Bidirectional bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-1d1e563f4ab7]

Also known as: Sumo, Emperor

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

36j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1984

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