Seiko Cal. 6331 - 309

Seiko 6331-309

This Hand-Winding model from 1977 features a 35mm Hardlex-Coated Steel case. The Fixed bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-e9e2665abc3a]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
11.0mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
17j
Frequency
28,800 bph
Power Reserve
41 hours
Year
1977

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