Seiko Cal. 5231 - 371

This Spring Drive model from 1967 features a 46mm Two-Tone case. It features a Navy dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-2f56f374b48a]

Also known as: World Timer, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Navy

Jewels

22j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1967

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