Seiko Cal. 6639 - 991

The Seiko 6639-991 represents an important milestone in Seiko's 1965 lineup. It features a Green dial protected by a Hardlex crystal and offers 200m of water resistance. [seikata-wm-d4941d73d683]

Also known as: Emperor

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1965

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