Seiko Cal. 6640 - 451

The Seiko 6640-451 represents an important milestone in Seiko's 1980 lineup. Powered by the 6640 caliber with 34j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-3dbc91b973fb]

Also known as: Sumo, Pogue

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1980

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