Seiko Cal. 6643 - 516

The Seiko 6643-516 represents an important milestone in Seiko's 1979 lineup. Powered by the 6643 caliber with 33j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-991d094520a7]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1979

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