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.
From 1868 the date letters followed a 25 year cycle.
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