Hi, Alex, and welcome to the forum! It's nice to know a german fan of Italian Disney Comics!

I try to answer your question. The Topolino 1370 isn't a real comic book issue, it wasn't in the newspaper kiosks: it's a special little book realized by some users of Papersera Forum. In Italy the number 1370 of Topolino was never edited due to a strike, so from the 1369 the collection goes directly to 1371. To realize a "fake" number 1370 was a joke, maked just for fun (not for money!) and of course in a very small number of copies. They were almost totally distributed during the "Mostra Mercato di Reggio Emilia" last month, as a nice gift for the ones who bought the book "Topolino Tremila".
So, sorry, I don't think it's possible to have one of them, unless someone who has one of the few copies decides to send it to you... I hope you can find him/her! Greetings to you, have a nice time with Disney Comics!