Wonderful French vintage mezzaluna or hachoir as it it otherwise known.  These are so useful in the kitchen to chop herbs or cheese. Just like this herb chopper a mezzaluna has a single curved steel blade with wooden handles at either end.  
 
This is a nice aesthetically pleasing rustic vintage hachoir mezzaluna herb chopper with a fabulous bulbous shaped wooden handle.  It shows beautiful characteristics of years of use.
 
Mezzaluna herb chopper size:  230mm