Seiko Cal. 3871 - 615

This Spring Drive model from 1975 features a 37mm PVD Black case. It features a Navy dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-b9f6b7dc9973]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1975

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