Yours is pre 1950. In 1949 or 50, the V for Vittorio was dropped from the logo, so it must be an early ZZ machine. Necchi didn't keep good records, but someone on the Necchi site may have some info. How nice you have a manual. Luckily the previous owner of mine left a threading chart in the drawer because it is a little different. I like the tension disk. Mine is my go to machine this week as my 301 blew her electric connection. THe Necchi did a good job FMQ. It is a very strong, quiet machine much like my Elna.
An excellent buy!