Seiko Cal. 6638 - 839

The 6638-839 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 26j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-d489345be831]

Also known as: UFO

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Champagne

Jewels

26j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1981

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