Seiko Cal. 6631 - 583

The Seiko 6631-583 represents an important milestone in Seiko's 1979 lineup. It features a White dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-d5595882ab34]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1979

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