The marks on the sucrier are, from left to right:
- maker's mark
- duty mark (the sovereign's head showing that the appropriate tax had been paid)
- crowned harp (fineness mark applied to silver and gold in Ireland)
- date letter
The Hibernia (Roman name for Ireland) mark was introduced in 1730 to indicate that duty had been paid. In 1807, when the duty mark became the sovereign's head, the Assay Office adopted Hibernia as the town mark for Dublin.
Note that the lion passant is the fineness standard mark for England only.