When you take a look at the Bottecchia, the rear fork isn't welded to the seat tube as it is on yours: LINK
Though on this picture the cabling is routed quite differently, but that may as well be because of the year this one was built.

I have quite some doubts about the Batavus as well, but that just may be because I'm Dutch and (as far as I know) "we" never used Italian standards.

Still... I'm going with Bertoni.