London’s assay-office mark is the leopard’s head. Because letters repeat over the centuries, the typeface, case and shield outline must all match the correct cycle.

Before you start: confirm the leopard’s head and use an office-specific table. Before 1975, each UK assay office used its own date-letter cycle.

London date letters, 1558–1677

London silver date letters 1558–1677 hallmark chart

London date letters, 1678–1775

London silver date letters 1678–1775 hallmark chart

London date letters, 1776–1895

London silver date letters 1776–1895 hallmark chart

London date letters, 1896–2001

London silver date letters 1896–2001 hallmark chart

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