Seiko Cal. 5670 - 640

The Seiko 5670-640 represents an important milestone in Seiko's 1989 lineup. Powered by the 5670 caliber with 22j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-e1a44b27be04]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1989

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