Seiko Cal. 5638 - 783

The 5638-783 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 34j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-af9624856d20]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1981

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