Seiko Cal. 6331 - 900

Seiko 6331-900

This Automatic model from 1990 features a 35mm Hardlex-Coated Steel case. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-3cf10b172aae]

Also known as: Tuna, Bullhead

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
8.9mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
110m
Dial Color
Green
Jewels
30j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1990

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