Seiko Cal. 6640 - 580

The 6640-580 is a sought-after Spring Drive piece from Seiko's golden era. It features a Cream dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-7dbd5ebccc0e]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Cream

Jewels

24j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1981

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