Seiko Cal. 6639 - 905

The 6639-905 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 17j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-de2771ff8aa3]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1998

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