Seiko Cal. 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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