What the Chamber of Commerce issues
This paper is a trade record, not a personal one. The Chamber of Commerce issues it for a named consignment and states where the goods were made. It belongs to that shipment alone, so it carries the exporter, the buyer, the goods and the marks on the cases.
Every word on it must mirror the invoice. Same seller, same buyer, same goods, same wording. Customs clerks abroad read the two side by side, and a mismatch of one line is enough for them to hold the cargo. Read both papers together before anyone stamps anything.
Anyone asking how to legalize a Certificate of Origin should first ask a different question: does the buyer's bank or customs office actually want the consular stamp? A letter of credit often lists the exact papers it will pay against, and that list decides your whole route.
Which desk signs it in Bari
A Chamber of Commerce paper is an office paper, so the Prefettura signs it. The Prefettura is the state's local branch and holds sample signatures for offices of that kind. Papers made by a notary or a judge follow the other road, to the Procura della Repubblica at the court.
Buy the €16 tax stamp before you go, bring the signed original, and expect the clerk to look only at the signature. To legalize a Certificate of Origin in Bari you therefore need the freshest issue you can get: if the signing officer has changed, an old sample is no help.
The consular step for a consignment
The embassy legalization of a Certificate of Origin in Bari finishes at the buyer country's embassy or consulate in Italy. Many trading nations want the invoice stamped in the same visit, so take both. Whether the step is wanted at all rests on that country's own rules, so ask the receiving authority and keep their reply.
Consular legalization of a Certificate of Origin in Italy commonly takes 10–15 business days, and 3–5 business days where a quicker slot exists. Set that against your sailing date, not against the day the goods leave the works, because papers that land after the vessel are worth little.
Cost, the clock and the cargo
Two fees apply. The €16 tax stamp is fixed by law; the consulate sets its own charge, which can differ per paper rather than per file. Ask them whether they price by sheet, since an origin paper plus an invoice plus a packing list may cost more than you budgeted for one file.
An embassy attestation of a Certificate of Origin in Bari falls over for dull reasons. A handwritten fix on the face of the paper is one. An exporter name that differs from the register is another. So is a load that has already sailed. Reprint rather than correct by hand, and start the chain the week the order is confirmed.