Seiko Cal. 3831 - 421

Seiko 3831-421

The 3831-421 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3831 caliber with 25j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-127c0b0d42f5]

Also known as: UFO, Navigator

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
13.0mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
150m
Dial Color
White
Jewels
25j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1985

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