Seiko Cal. 5231 - 940

This Spring Drive model from 1975 features a 41mm Two-Tone case. It features a Silver dial protected by a Mineral crystal and offers 60m of water resistance. [seikata-wm-cffb02f0d24d]

Also known as: Monster, Rally

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

19j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1975

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