Seiko Cal. 4528 - 639

The Seiko 4528-639 represents an important milestone in Seiko's 1980 lineup. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-5fcc114ed39a]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

28j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1980

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