Marking: [1] a B, 2 pellets, a monkey, in a lozenge (maker's mark of Biennais)
[2] Head of Apollo with numeral 1, in an oval (unofficial assay mark for first standard silver, 1794-97)
[3] A cock, flanked by A and I, in a vertical octagon (official assay mark for first standard silver, 1798-1809)
[4] A man's head, flanked by numerals 8 and 5 reversed and inverted, in a circle (excise mark for medium-sized work, 1798-1809)
Location of marks:
[1], [2] on rim
[3], [4] on underside
