Seiko Cal. 6639 - 378

This Solar model from 1990 features a 41mm PVD Black case. Powered by the 6639 caliber with 35j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-fac6d3fd7db1]

Also known as: UFO, Flighty

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

35j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1990

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