Click on the letter you want to date or on a date letter cycle (column) in the table below to see a larger view:
From 1681 to 1710 a date letter was used but this was discontinued until 1819 when an official assay office was established in Glasgow with date letters being reintroduced. The letter S used during the interim probably signified "sterling". Between 1784, when a silver duty was introduced, and 1819 Glasgow goldsmiths sent their wares to Edinburgh for assay. Date letters changed in July each year.
The Glasgow Assay Office closed on 31st March 1964.