Seiko Cal. 6640 - 763

The Seiko 6640-763 represents an important milestone in Seiko's 1984 lineup. It features a Cream dial protected by a Hardlex crystal and offers 170m of water resistance. [seikata-wm-1edc7c21a544]

Also known as: Goldfeather, Golden Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1984

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