Seiko Cal. 6156 - 638

This Spring Drive model from 1973 features a 34mm Gold-Plated case. It features a Black dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-71b6d73e34a4]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1973

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