Seiko Cal. 3891 - 521

Seiko 3891-521

The 3891-521 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 3891 caliber with 21j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-02ecff32c7d1]

Also known as: Sumo, Goldfeather

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
8.0mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
100m
Dial Color
Black
Jewels
21j
Frequency
36,000 bph
Power Reserve
51 hours
Year
1994

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