Seiko Cal. 6643 - 636

The 6643-636 is a sought-after Solar piece from Seiko's golden era. Powered by the 6643 caliber with 28j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-0f3bea750fe5]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

13.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Cream

Jewels

28j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1991

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