Seiko Cal. 5631 - 393

The Seiko 5631-393 represents an important milestone in Seiko's 1982 lineup. It features a Navy dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-99630645ad4a]

Also known as: Sea Horse, Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1982

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