Seiko Cal. 6639 - 321

The 6639-321 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6639 caliber with 18j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-76c8f8963eb7]

Also known as: Rally, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

200m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1988

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