Seiko Cal. 6331 - 771

This Automatic model from 1968 features a 42mm PVD Black case. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-0825c92e2554]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1968

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