Seiko Cal. 6331 - 207

This Spring Drive model from 1979 features a 42mm Gold-Plated case. It features a Black dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-5f33231b39c6]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1979

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