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More about Half Bottles of Italian red wine
Italy has its own complex wine classification system, and like the French, it is primarily geographically-based so you have to know what grapes are grown where to figure out what is in the bottle.
The top classification is DOCG of which there are 21; 7 are in Piemonte, the finest of which are made from Nebbiolo grapes; 6 are from Tuscany primarily based on the Sangiovese grape.
If you want to get more detail you might read 'Native Wine Grapes of Italy' by Ian D'Agata which runs in excess of 600 pages.