Seiko Cal. 5637 - 509

The 5637-509 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-4157da55a48a]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1970

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