Seiko Cal. 6640 - 430

This Spring Drive model from 1971 features a 41mm Gold-Plated case. Powered by the 6640 caliber with 33j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-55c4872e4cc7]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1971

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