http://www.legislation.gov.uk/id/ukpga/1985/72

SCHEDULES

SCHEDULE 2 Existing United Kingdom Primary Standards andAuthorised Copies

Part II Description of United Kingdom primary standard of the pound

A platinum cylinder about 1.35 inches in height and about 1.15 inches in diameter marked “PS 1844 1 lb”, having its edges rounded off and a groove about 0.34 inch below the top of the cylinder.