Seiko Cal. 3831 - 721

Seiko 3831-721

The Seiko 3831-721 represents an important milestone in Seiko's 1974 lineup. Powered by the 3831 caliber with 33j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-1530852598fe]

Also known as: Tuna

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
40mm
Case Thickness
9.2mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
190m
Dial Color
Burgundy
Jewels
33j
Frequency
21,600 bph
Power Reserve
58 hours
Year
1974

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seikata-wm-1530852598fe