This would be a very difficult case for several reasons.

Technically, your dad naturalized with his mother in 1964 and would have lost citizenship at that time. The only thing that would have possibly preserved that citizenship would be the citizenship of his father. But the way it stands, Oreste ...

I’m sorry. I was incorrect. I didn’t notice that your dad was not born in Australia.

Was your father officially adopted by Oreste?

You can easily go though your grandmother since your father was not born BEFORE 1948.

To live and work in Italy, you will need a work visa and something called a permesso di soggiorno, which gives you the right to stay. If you have a job already, your company can sponsor you, but without that, it is more difficult. I suggest you do a Google search on Italian work visas and the ...

Why don’t you list the line you will be using. We can then define the path.

Example

Ggf born —- naturalized- ———
Gf born (where) date
m born (where) date
You

The naturalization of your ggf during his minority (derivative naturalization) eliminates the possibility of applying through his line. Did your ggm naturalize?

Might you have a possibility through your mother’s line?

The gm was born to an Italian man in 1934. She had her child after 1948.

The only possible issue is if the ggf naturalized as a minor or as an adult before gm was born.

Even though those words appear on the Declaration of Intent, loss of Italian citizenship only occurred on the date of actual naturalization.

Re renunciation, this is very difficult to do. You must actually go to a consulate and formally renounce. Nothing else, even serving in the military ...

Not a 1948 case. It goes through the paternal line until after 1948.

Also, since your ggf was a minor when he arrived, you will need to check if his father (your gggf) naturalized while he was still in his minority.

Generally, to obtain documents from a comune, you need to contact them in writing. Some will respond to a written request; others insist on an email contact. However, to write to a comune through email, you will likely need a PEC address, which is a more secure email.

Since you have the specific ...

To be more specific:

Your 4x grandfather was not born with Italian citizenship since the Kingdom of Italy had not yet been formed. If he were still alive in 1861 AND had not naturalized to become a Peruvian citizen, then he acquired Italian citizenship at that time. There may still be an issue in ...

There is not enough information to answer your question. First and foremost was your 4xgrandfather still living in 1861 (Italy’s unification)? If he was still living, did he naturalize, and, if so, when?

If you are certain you qualify, make an appointment with your consulate. Appointments are difficult to obtain, so you will have plenty of time to obtain your documents.

You may need the help of a professional genealogist since very few of the records for Napoli have been digitalized.