Seiko Cal. 6639 - 178

The 6639-178 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 36j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-8fe96433988d]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

13.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1974

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