Seiko Cal. 5631 - 581

The 5631-581 is a sought-after Hand-Winding piece from Seiko's golden era. With its 20mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-06f4e58c2b43]

Also known as: Silverwave

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1998

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