I think it's die dent. This is the second version of the well-known error on the 100 Lira 1972/ which is listed in almost all catalogs, while the second one was discovered in the same period as 1972/ and you can also find it very rarely, it is not included in the catalog even though it is of greater intensity, that's why very few people know about this mistake, more precisely, only those who have run into it.

























