Seiko Cal. 3831 - 721

Seiko 3831-721

The 3831-721 is a sought-after Quartz piece from Seiko's golden era. Powered by the 3831 caliber with 28j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-30e5713458c7]

Also known as: Monster, Rally

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
39mm
Case Thickness
14.2mm
Lug Width
18mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
30m
Dial Color
Black
Jewels
28j
Frequency
21,600 bph
Power Reserve
43 hours
Year
1976

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seikata-wm-30e5713458c7