• Oct 16, 2025 200 Lire Centenario Dellarsenale Militare Marittimo Di Taranto Valore rket valuations Understand the Grading System Familiarize yourself with the coin grading standards eg Professional Numismatic Guild PNG grading Verify Authenticity Ensure that the coin is genuine Forgeries can significantly devalue the piece Engaging a professional to verify auth By Dr. Joana Hackett