It starts as a private paper
A letter from your branch is not a public record. Nobody in the Italian chain has a sample of your manager's handwriting, so nothing can be matched. That is the whole difficulty here, and it is why people who ask how to legalize a Bank Reference Letter get a longer answer than they expected. The signature has to be vouched for before it can be stamped.
Getting the wording right first time
Ask the reader abroad what the letter must contain before your branch types a word. Most want the account holder's full name as it appears on the passport, the date the account was opened, and the branch that holds it. Some want a statement of good standing and nothing more. A letter that misses one line is a letter written twice.
Insist on headed paper, a hand-written signature, and the signer's name and job title printed underneath. An unnamed squiggle cannot be traced by anyone. Ask for two copies while you are there, since a second reader often appears later. Both cost you one trip instead of two.
Which Turin counter takes it
For most people who legalize a Bank Reference Letter in Turin the answer is the Prefettura. It is the state's local office in the province and it handles administrative papers, which is where this file normally lands. The Procura della Repubblica, sitting at the tribunal, is the counter for notarial and court acts. If a notary is the one who certifies your banker's signature, the file may belong there instead.
That fork is worth a phone call. The two offices are not in the same building, and neither will forward a file for you. So confirm the desk once the certification is on the sheet, not before. We check it as a matter of routine on every bank file we handle.
Cost and clock
The consular legalization of a Bank Reference Letter in Italy is billed by two different hands. Two charges are fixed by different people: Italy asks for a €16 marca da bollo, the tax stamp, and the consulate names its own fee. Your bank may also charge for writing the letter. Ask the branch about that at the same time you ask for the wording.
Expect 10–15 business days once the bank has signed and the certification is done. An express run of 3–5 business days is available where a visa interview or a tender date is already booked. The letter's short shelf life is the real pressure here. Order it late in the chain rather than early.
Why desks abroad want it
The embassy legalization of a Bank Reference Letter in Turin is usually one line on somebody else's checklist. Visa and residence files use it to show funds. Company registries abroad ask for it when an Italian shareholder pays in capital, and tender boards use it to test whether a bidder can carry the work. Landlords and schools ask for a lighter version of the same thing.
Whether the consulate has to sign at all depends on the destination country, and only the receiving authority can tell you. Some accept a single-step certification and want nothing else; others run the letter through their own office in Italy. Ask before you pay for the last leg. The embassy attestation of a Bank Reference Letter in Turin is quick to add, and impossible to undo cheaply if it was never needed.
Where the letter is going to be read in another tongue, confirm the required language with the receiving office in writing first. Banks sometimes offer a two-column letter, which can save a translation. If they do not, order the translation only once the wording is final. A retyped letter makes an earlier translation worthless.