SilverMine	British Silver Marks Sheffield 1773 --1999 1773 - 1893 1893 - 1999

The Sheffield Assay Office was founded (along with Birmingham) in 1773. The Town Mark of a crown (sometimes in the same punch as the date letter on smaller wares and jewellery) was changed to a Tudor rose in 1975 with the harmonisation of British Assay Offices. The date letter was changed in July until that time when it (along with the other Assay Office date letters) changed in January. Note that the date letters did not follow an alphabetic sequence until 1824. .