I have two 100 lira coins, one from 1974 and one 1977 and both of them have a reverse die error. The front and back of both coins are completely opposite. If you are looking at the front with the head "upright" and then you flip it over without rotating at all, the reverse is completely upside down. I'm wondering if anyone can help me determine the value of these coins or at least if they are something "special"
Thank you in advance!