The booklet itself is never stamped
A passport belongs to the state that printed it, and no clerk here will add anything to its pages. What travels instead is a copy that a public official has marked as a true likeness of the booklet you showed them. That marking, called a copia conforme, carries the official's signature and seal. From then on the copy is the paper everyone works with.
Who signs the copy decides the route
Two different people can certify a copy, and the choice steers the rest of the job. A clerk at the town hall makes it an ordinary state paper. A notary makes it a deed, because a notary's signature is a notarial act. So the answer to how to apostille a Passport Copy always starts with a question back to you: who held the booklet and signed the copy?
Take a photo of the certified sheet and send it over before you go any further. We can read the stamp on it and tell you which counter will take it. Guessing costs a morning, and the two counters do not cover for each other.
The two counters, plainly
State papers, including a copy certified at the town hall, are the Prefettura's work. Deeds drawn up before a notary are the Procura della Repubblica's work. That split holds wherever you apostille a Passport Copy in Italy. A notarised copy from this city goes to the prosecutor's counter. A town hall copy goes to the state office. Both counters sit in the same province as the signature.
Pages, and what you pay
Decide first how much of the booklet the reader needs. Many will take the photo page alone; a bank or a company registry may want every page with ink on it. Each certified sheet counts as one paper. So the apostille cost for a Passport Copy in Bari is the €16 tax stamp per sheet, unless that sheet is exempt. Ask the reader what it wants before you pay to certify twelve pages you will never use.
Who asks to see one
Banks abroad want it to open an account, company registries want it to name a director, and a foreign lawyer may want it to check who is signing a contract. So people apostille a Passport Copy in Bari far more often for money and business than for travel. Each of those readers has its own habits, and the surest move is to ask in writing what it will accept.
Note also that the legalisation of a Passport Copy in Bari is about signatures, not about your identity. It proves the official who certified the copy really holds that post. Where the reading desk works in another tongue, it may want the certification wording sworn as well. Confirm the required language with the receiving office in writing before anything is translated.