Seiko Cal. 5638 - 510

Seiko 5638-510

The 5638-510 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5638 caliber with 27j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-f51691c21c79]

Also known as: Sumo

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
44mm
Case Thickness
8.7mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Cream
Jewels
27j
Frequency
21,600 bph
Power Reserve
62 hours
Year
1981

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