Seiko Cal. 5638 - 531

The 5638-531 is a sought-after Hand-Winding piece from Seiko's golden era. With its 20mm lug width and 12.6mm profile, it sits comfortably on most wrists. [seikata-wm-afb67abdc234]

Also known as: Bullhead, Emperor

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1988

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