Seiko Cal. 6643 - 908

The Seiko 6643-908 represents an important milestone in Seiko's 1988 lineup. Powered by the 6643 caliber with 25j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-54ec978083b3]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

190m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1988

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