Seiko Cal. 7181 - 331

The 7181-331 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-f8cc53a8e8e9]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1975

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