Seiko Cal. 5638 - 783

Seiko 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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