Seiko Cal. 5231 - 666

The Seiko 5231-666 represents an important milestone in Seiko's 1988 lineup. It features a Green dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-0c1ab2ab29cb]

Also known as: Sumo, Silverwave

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1988

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