Seiko Cal. 6640 - 989

The Seiko 6640-989 represents an important milestone in Seiko's 1966 lineup. It features a White dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-9fbc0c464844]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

White

Jewels

32j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1966

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