The NGC certification of the 1729 Utrecht Gold Ducat (NGC Cert# 6847137-003) provides a guarantee of the coin's authenticity and condition, despite being noted as 'Cleaned'. This detail, along with the coin's UNC DETAILS grade, signifies that while it has been preserved with great care, it has undergone cleaning, which is common for coins recovered from shipwrecks. This level of preservation combined with its historical provenance makes it a rare and valuable find.