Seiko Cal. 6638 - 404

The 6638-404 is a sought-after Solar piece from Seiko's golden era. Powered by the 6638 caliber with 27j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-276b07174c1f]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

27j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1982

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