Seiko Cal. 6640 - 959

The 6640-959 is a sought-after Solar piece from Seiko's golden era. Powered by the 6640 caliber with 20j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-f85f6dd33dac]

Also known as: Bullhead, Rally

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

46mm

Case Thickness

13.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1980

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