Seiko Cal. 6640 - 762

This Hand-Winding model from 1970 features a 41mm Gold-Plated case. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-5a787c7afbbb]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1970

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