Seiko Cal. 6331 - 864

Seiko 6331-864

The Seiko 6331-864 represents an important milestone in Seiko's 1984 lineup. Powered by the 6331 caliber with 30j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-ecbe9c9e9c34]

Also known as: Sumo, UFO

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
41mm
Case Thickness
11.2mm
Lug Width
22mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
30j
Frequency
21,600 bph
Power Reserve
66 hours
Year
1984

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