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1889 and stored at the International Bureau of Weights and Measures in Sèvres, France. It is the only SI unit that is defined by a physical object rather than a fundamental physical property that can be reproduced in laboratories.
The stone is a unit of weight in the imperial system used informally in the UK and Ireland, almost exclusively as a measure of body weight. Although sanctioned by the EU for use as a supplementary unit it is essentially obsolete outside the UK and Ireland. This site is owned and maintained by Wight Hat Ltd.