Seiko Cal. 6639 - 747

The Seiko 6639-747 represents an important milestone in Seiko's 1984 lineup. It features a Black dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-9021da1fc92b]

Also known as: Monster

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

13.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1984

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