Seiko Cal. 6651 - 426

This Spring Drive model from 1969 features a 37mm PVD Black case. Powered by the 6651 caliber with 20j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-ad2dd88d6116]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1969

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