Seiko Cal. 6663 - 668

The 6663-668 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6663 caliber with 32j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-898c1c51e3df]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Silver

Jewels

32j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1970

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