Seiko Cal. 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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