Seiko Cal. 6631 - 673

The 6631-673 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6631 caliber with 27j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-e387778ef385]

Also known as: Monster

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1999

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