Seiko Cal. 6640 - 972

This Automatic model from 1990 features a 43mm Stainless Steel case. Powered by the 6640 caliber with 21j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-b452434e8394]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1990

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