Seiko Cal. 6639 - 856

The 6639-856 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6639 caliber with 27j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-5192e35ca70c]

Also known as: UFO

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

46mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Silver

Jewels

27j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1986

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