Half-Mark
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
A noble; six shillings, eight pence.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A noble, or six shillings and eight pence in English money.
Defined under Half in Black's Law Dictionary.