Quote: "gros"Hello
for
the first one
https://en.numista.com/catalogue/pieces27439.html
Hartill #16.249 common coin should be a real one
good size
For these two coins, it doesn't seem to be the same song

Look to these two coins with the same looking like copper allow although they are 700 years apart ...
Other exemples of "
yuan feng tong bao" don't look like that. You could argue that it might come from cleaning or polishing but I hardly believe it, I only see poor casting quality with porosity.
A
specialist is deemed necessary to determine if it's a genuine coin