Seiko Cal. 3828 - 556

This Spring Drive model from 1977 features a 43mm Two-Tone case. Powered by the 3828 caliber with 17j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-67af34a32ef4]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1977

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