Hello banknote lovers!
I am adding a lot of background checks for wrong information assigned to the catalogue listings, so it can be corrected easily and I would like to know something about banknote manufacturing techniques, especially, if any of them appeared after certain date (when they were invented).
Giving you example from coins, we know for certain that coin milling machines appeared only after 1550, so I can ran background check for all coins that might have this manufacturing technique assigned and are older than 1550, and I know it is wrong.
Anyone knowledgeable enough here on this? 🙈
Best regards,
Jarek