Seiko Cal. 6643 - 513

Seiko 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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