Seiko Cal. 6631 - 859

The 6631-859 is a sought-after Solar piece from Seiko's golden era. With its 19mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-c0f44ceec6df]

Also known as: Sumo, Silverwave

Specifications

Movement

Solar

Case Material

Titanium

Case Width

37mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

24j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1986

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