Seiko Cal. 6643 - 111

The Seiko 6643-111 represents an important milestone in Seiko's 1977 lineup. Powered by the 6643 caliber with 28j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-8aa08660715d]

Also known as: Tuna, Helmet

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

Green

Jewels

28j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1977

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