Seiko Cal. 6640 - 499

The Seiko 6640-499 represents an important milestone in Seiko's 1970 lineup. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-0cb23ae0a581]

Also known as: Bellmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1970

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