Seiko Cal. 6643 - 897

The 6643-897 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6643 caliber with 29j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-1b08597d480e]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1980

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