Seiko Cal. 6639 - 632

The 6639-632 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 33j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-1fc6ac206db4]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

190m

Dial Color

Navy

Jewels

33j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1999

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