There is a short paper titled THE STRIKING OF PROOF AND PATTERN COINS IN THE EIGHTEENTH CENTURY by G. P. DYER AND P. P. GASPAR
I haven't read it yet (it's in the queue!) but it may be of some help.
https://www.britnumsoc.org/publicat...NJ_50_12.pdf
I haven't read it yet (it's in the queue!) but it may be of some help.
https://www.britnumsoc.org/publicat...NJ_50_12.pdf
The Ox moves slowly, but the Earth is patient.