Seiko Cal. 6640 - 631

The Seiko 6640-631 represents an important milestone in Seiko's 1991 lineup. It features a Burgundy dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-fdd8267f9e67]

Also known as: Pogue

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Burgundy

Jewels

28j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1991

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