Seiko Cal. 6639 - 204

The Seiko 6639-204 represents an important milestone in Seiko's 1979 lineup. With its 19mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-1f4f78e1d8a2]

Also known as: UFO, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1979

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