Seiko Cal. 6687 - 639

The 6687-639 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6687 caliber with 19j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-7ffc1a1d5565]

Also known as: Sumo, Flighty

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1976

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