Seiko Cal. 4431 - 633

Seiko 4431-633

The Seiko 4431-633 represents an important milestone in Seiko's 1976 lineup. Powered by the 4431 caliber with 28j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-b98873061266]

Also known as: UFO, Arnie

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
46mm
Case Thickness
10.5mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
28j
Frequency
36,000 bph
Power Reserve
60 hours
Year
1976

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seikata-wm-b98873061266