Seiko Cal. 6640 - 663

The 6640-663 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-34ac3729880e]

Also known as: Golden Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

28j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1996

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