Mike, there is a Nero 400,and a Nero 600,it was a typing eror,they are the same.
Also called Valle Calda.
XXX:In my climate out of the 2, I am pleased with Nero 600m only.
Violette is super delicious every year, ,in most climates ,but not in mine.
Nero 600m, can take my difficult climate,that is the difference.
I am sure Violette de B is delicious in your climate.