Hi all, as far as I understand the guidelines, different locations/facilities of mints are listed separately. Currently we have all locations of the mints in Rome listed under Rome (476-date), with 600+ of the almost 3000 currently registered coins being the circulation coins under unification.
- Via del Banco di Santo Spirito, 31, 00186 Roma (1508-1541)
- Piazza San Pietro, 00120 Città del Vaticano (1665-1911)
- Istituto Poligrafico e Zecca dello Stato, previously Regia Zecca (1911-1999) Via Principe Umberto, 4 – 00185 Rome
- Istituto Poligrafico e Zecca dello Stato (1999-date) Via Gino Capponi, 47-49, 00179 Roma. This is the current location of the production of Euro coins
Coins between c. 778-15th cent were made at Capitoline Hill.
https://it.wikipedia.org/wiki/Istituto_Poligrafico_e_Zecca_dello_Stato
https://renatoprosciutto.com/palazzo-zecca-banchi-rome/
https://onlinecoin.club/Info/Mints/Papal_Mint/
Personally I do not think separate locations of mints should constitute separate listings (ex. Monnaie de Paris plants currently listed together vs. Royal Mint listed separately), but there should at least be a record of all of the locations
https://en.numista.com/catalogue/mint.php?id=22