Seiko Cal. 6331 - 885

This Spring Drive model from 1976 features a 37mm PVD Black case. Powered by the 6331 caliber with 19j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-ddfb91b2c313]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Silver

Jewels

19j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1976

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