Seiko Cal. 4421 - 851

Seiko 4421-851

The 4421-851 is a sought-after Kinetic piece from Seiko's golden era. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-e7499fb84b31]

Also known as: Sumo, Helmet

Specifications

Movement
Kinetic
Case Material
Stainless Steel
Case Width
45mm
Case Thickness
13.9mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
40m
Dial Color
Burgundy
Jewels
29j
Frequency
21,600 bph
Power Reserve
59 hours
Year
1976

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