Control Marks

The sponsor's mark, fineness mark and the assay office mark are compulsory marks. The crown on gold, the lion passant for 925 silver, and the orb for 950 platinum and the date letter in all cases are voluntary additional marks.


Sheffield Assay Office, Guardians' Hall, 137 Portobello Street, Sheffield S1 4DR  Tel: +44 (0)114 2755111
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