'I have been told your neighbour Mr Martyn has a good collection of Roman coins; if he has, pray examine if the reverse of any of them have not yet been published, and particularly whether he has any of Carausius with uncommon types, or indeed of any other tyrant whose history is little known. I have lately engraved two very singular coins from Mr. Gale's cabinet'
(Nichols 1781-1790, pp. 471-2; Burnett 2020b, p. 1286 n. 1092)