Seiko Cal. 6331 - 670

This Spring Drive model from 1980 features a 40mm PVD Black case. Powered by the 6331 caliber with 19j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-64fca524781b]

Also known as: Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Black

Jewels

19j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1980

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