Seiko Cal. 6647 - 841

The 6647-841 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6647 caliber with 29j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-550275556f1d]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

29j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1997

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