1956 Italy 100 Lire Grade?

Nice coin. I've acquired many of these over the years. Catalog value places your coin around $3-$4. However, these coins were mass produced (nearly 100 million were made). So, the chances of you getting $3-$4 for it is unlikely. I'd say a reasonable price your average collector would be willing to pay is between 25 cents and $2 depending on the experience of the buyer. I have a ton of them in XF-40 condition that I picked up for around 10 cents each.

I wish they were worth some real money. I have a few 100 of these as well as several hundred other pre Euro Italian coins from when I lived in Sicily.

If you have any of these 500 lire coins http://en.numista.com/catalogue/pieces2716.html then you've hit silver. Otherwise I don't know of any valuable late pre-euro italian coins. The mintages were high all the way until the end.