I'll post everything I know, 1 point goes to Quiller, because he found all the info I had, and the other one will go to you Arunas, if you can give some more detail.
I have been informed that the name for this car is Pajtás (Buddy).
Ladies and gentlemen, we have a winner!
Well done pal...and thanks to Pal.
Thanks, Arunas, great picture!
Unbelievable!
I was looking into some old issues of Quattroruote (1960) for some pictures of a Moretti and I saw this car! It is a short article, with no name and only a reference to his engine, a 250cc in the back. The picture is a better version of the one I posted.
... is a great book with some very nice Russian prototypes...