Seiko Cal. 3899 - 790

Seiko 3899-790

This Hand-Winding model from 1971 features a 37mm Stainless Steel case. Powered by the 3899 caliber with 28j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-f6058305bd2f]

Also known as: Sumo, Helmet

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
10.8mm
Lug Width
22mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
160m
Dial Color
Black
Jewels
28j
Frequency
28,800 bph
Power Reserve
67 hours
Year
1971

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