Seiko Cal. 6639 - 528

The Seiko 6639-528 represents an important milestone in Seiko's 1995 lineup. Powered by the 6639 caliber with 30j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-29662169e4fb]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

12.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1995

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