Thanks for the reply. I'll follow your suggestion and let it go. The second question is:
where I could find a good dealer in Italy?
I met a few days ago a very competent antique seller in Milan, who showed me a couple of beautiful pieces, but the prices were really important (nice katana, dated 1804 w certificate, I liked it very much but 17K usd for my first sword seems lots of money).
I have to tell you that I'm studying. So I decided to study first, and buy later. But I'd like to "take in my hands" a few items just to practice and try to undestand all the differences (ant there are plenty of them) between two swords.