Seiko Cal. 6640 - 851

The Seiko 6640-851 represents an important milestone in Seiko's 1972 lineup. It features a Cream dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-ecbc9904d507]

Also known as: Monster, Sea Horse

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

9.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Cream

Jewels

23j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1972

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