Seiko Cal. 5666 - 731

The Seiko 5666-731 represents an important milestone in Seiko's 1987 lineup. It features a Navy dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-0d5da66b7e9d]

Also known as: Arnie

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

33j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1987

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