Seiko Cal. 6633 - 639

The 6633-639 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6633 caliber with 18j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-ca71cd02805a]

Also known as: Sumo, Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

Champagne

Jewels

18j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1965

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