The Company of Cutlers in Hallamshire, incorporated by Act of Parliament in 1624, still controls the Sheffield certification mark. Anyone who wants the word Sheffield in a company name needs a letter of non-objection from the Cutlers' Company before Companies House will register it.
The Made in Sheffield mark, introduced in 2005 and jointly owned by the Cutlers' Company, Sheffield City Council and the Chamber of Commerce, has more than 200 licence holders. A manufacturer in the S postcode area applies for it.
The Sheffield Assay Office, established by Act of Parliament in 1773, is one of only four in the United Kingdom permitted to strike a hallmark into precious metal.