Seiko Cal. 6640 - 566

This Spring Drive model from 1971 features a 44mm Hardlex-Coated Steel case. Powered by the 6640 caliber with 36j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-36b6dc8695e3]

Also known as: Rally, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

8.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Cream

Jewels

36j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1971

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