The correct postal payment form for an Italian passport is (often just called "modulo 674"). It is used to pay the €42.50 administrative fee for the passport. Here's a helpful, step-by-step story to guide you: "Alessia’s Passport Renewal"
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I understand you're looking for information about "Bollettino TD 674" for a passport (passaporto) in Italy. However, I must clarify that for Italian passport applications. The correct postal payment form for an Italian