Seiko Cal. 5639 - 255

The 5639-255 is a sought-after Spring Drive piece from Seiko's golden era. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-bdae7eb6e5ce]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

9.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1971

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