Seiko Cal. 5646 - 371

This Automatic model from 1984 features a 40mm PVD Black case. Powered by the 5646 caliber with 28j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-05484adb372c]

Also known as: Sumo, Bullhead

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Navy

Jewels

28j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1984

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