Seiko Cal. 6631 - 886

The 6631-886 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6631 caliber with 36j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-17cbb24ff13c]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

36j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1966

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