Seiko Cal. 4431 - 391

Seiko 4431-391

The 4431-391 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4431 caliber with 36j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-645db3759f68]

Also known as: Bullhead

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
44mm
Case Thickness
13.4mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
60m
Dial Color
Cream
Jewels
36j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1969

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