Doitkin, or doit
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A small coin.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A base coin of small value, prohibited by St. 3 Hen. V. c. 1. We still retain the phrase, in the common saying, when we would undervalue a man, that he is not worth a doit Jacob.