Seiko Cal. 6640 - 956

The 6640-956 is a sought-after Kinetic piece from Seiko's golden era. It features a Cream dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-cda0b6bdfcf9]

Also known as: Crown, Golden Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Cream

Jewels

23j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1967

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