'At the same time I beg the favour of yr lending him [Mr. Sturt] Patins Numismatat to copy from thence pag. 94 the figure of Apollo Didymeus out of a middle brass coyn of Caligula. which coyn in Patin I beg you would look out in ye book & show to him for fear of mistake. He will show you how and where I design it.
I want likewise to be copyed by him a small coyn of K. Prusias out of Spanheim de prest. numism. 1st Vol. fol. imag. 5/4. if it be not too much trouble for you to send him likewise that Book, which he will return ye same day you send it.
...
I beg my humble service to Dr Mead: from whom I am promisd this favour of these coyns you brought home now placd in ye cabinet of the Duke of Devon, viz. ΚΝΩΣΙΩΝ ΠΟΛΧΟΣ Haym 2d. Part pag. 117. [retrograde script] pag. 144. ΣΑΞΙΩΝ pag. 147. But if I cannot see them in time I shall be contented with copying them from Mr Haym.
...
But I now principally want a good coyn or two ΤΗΙΩΝ with ye reverse a Bacchus cum cantharo, older than the times of ye Roman Emperors if it may be had, and about the procuring of this I beg you would confer with Dr Mead, and use your joint endeavours to favour me with it.'
(Royal Society, MS 253/188; Burnett 2020b, p. 609)