Seiko Cal. 6643 - 513

The Seiko 6643-513 represents an important milestone in Seiko's 1978 lineup. Powered by the 6643 caliber with 25j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-2fc022c07c1d]

Also known as: Sumo, Shogun

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

12.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1978

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