Seiko Cal. 6640 - 698

Released in 1969, the Cal. 6640 with design code 698 was part of Seiko's domestic market collection. It features a Cream dial protected by a Acrylic crystal and offers 110m of water resistance. [seikata-wm-fbf2238da9e8]

Also known as: Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1969

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