Seiko Cal. 6657 - 739

The 6657-739 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6657 caliber with 21j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-4a9d96c69c23]

Also known as: Goldfeather, Navigator

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Green

Jewels

21j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1968

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