Seiko Cal. 3870 - 399

This Automatic model from 1971 features a 37mm Two-Tone case. Powered by the 3870 caliber with 32j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-99c1c5876f94]

Also known as: Sumo, Emperor

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1971

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