Seiko Cal. 3815 - 520

This Spring Drive model from 1985 features a 37mm PVD Black case. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-ac6d4b6caa7d]

Also known as: Sumo, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1985

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