Seiko Cal. 6643 - 145

The Seiko 6643-145 represents an important milestone in Seiko's 1971 lineup. Powered by the 6643 caliber with 22j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-d49540344b9c]

Also known as: Helmet, World Timer

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1971

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