Seiko Cal. 6640 - 430

The Seiko 6640-430 represents an important milestone in Seiko's 1981 lineup. Powered by the 6640 caliber with 18j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-2b412342abc3]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

8.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1981

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