Seiko Cal. 6639 - 283

The Seiko 6639-283 represents an important milestone in Seiko's 1978 lineup. The Fixed bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-d74268abf97c]

Also known as: UFO, Baby Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

11.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

30m

Dial Color

Cream

Jewels

30j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1978

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