Seiko Cal. 6643 - 394

This Hand-Winding model from 1969 features a 37mm Hardlex-Coated Steel case. Powered by the 6643 caliber with 29j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-e4fdfd7cf6f3]

Also known as: Tuna, Arnie

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1969

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