Plate Assay Act, 1783

If of 18 carats, marked (18) and initials,

stamped in Dublin with Unicorn's head, in New Geneva with a collar round it.

V. And be it further enacted, That no person shall sell, exchange, export, or cause to be sold, exchanged or exported any gold vessel, gold plate, or other manufacture of gold being of the aforesaid standard of eighteen carats fine, unless it be marked with the mark of the maker, which mark shall be the number (18,) and the first letter of the christian and sirname of the maker, nor unless it be likewise stamped at the assay-office in Dublin, with an Unicorn's head, or at the assay-office in New Geneva aforesaid, with an Unicorn's head and collar round the neck, under the like penalty as aforesaid.