Seiko Cal. 6640 - 585

The Seiko 6640-585 represents an important milestone in Seiko's 1967 lineup. It features a Silver dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-d6f56c1a297d]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Silver

Jewels

30j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1967

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