Sell old coins

Professional buyers must prioritize third-party grading services (TPG) such as NGC (Numismatic Guaranty Company) or PCGS (Professional Coin Grading Service). Authenticity is verified through slabbing (sonic-sealed plastic holders) which includes a unique serial number and a grade on the Sheldon Scale (1-70). For uncertified bulk lots, buyers should verify metallic composition using XRF scanners and check for signs of artificial toning or cleaning, which significantly reduces market value.

Compliance is critical to avoid legal repercussions. Buyers must ensure adherence to the 1970 UNESCO Convention on the Means of Prohibiting and Preventing the Illicit Import, Export and Transfer of Ownership of Cultural Property. For U.S. imports, check Memorandums of Understanding (MOU) that restrict specific ancient coins. Always request a Provenance Statement or a 'Chain of Custody' to prove the coins were not illegally excavated or smuggled.

Accurate B2B listings require five core specifications: Mintage Year, Mint Mark, Weight (in grams to two decimal places), Diameter (mm), and Metal Content (e.g., .900 Silver, .999 Gold). For circulation strikes, identify the KM number (Krause-Mishler catalog) to ensure global standardized identification across inventory systems.

To maintain the 'State of Preservation,' coins must be stored in PVC-free flips or acid-free paper envelopes. PVC contains plasticizers that create 'green slime' (corrosion) over time. For high-value inventory, maintain a controlled environment with humidity levels below 35% RH to prevent oxidation, especially for copper and silver issues.

The most significant risk is the prevalence of high-quality counterfeits (super-fakes), particularly in silver dollars and ancient gold coins. Another risk is customs seizure if the items are classified as 'cultural relics' by the exporting country. To mitigate this, use Made-in-China.com's verified supplier system to identify reputable exporters who provide legal export permits and commercial invoices clearly stating the items are 'numismatic collectibles for investment'.

Negotiations should be based on the 'Grey Sheet' (wholesale) pricing or current Spot Metal Prices plus a numismatic premium. For bulk 'junk silver' or unsearched bags, negotiate based on Total Fine Weight (TFW). Professional buyers should aim for a 15-25% margin below retail auction records to account for shipping, insurance, and re-grading costs.

Always use fully insured, trackable courier services (like FedEx or DHL) and declare the items as 'Numismatic Coins' rather than 'Money' or 'Currency' to comply with carrier policies. For transaction security, utilize Escrow services or Trade Assurance to ensure funds are only released once the coins have been inspected and verified by your local numismatist or grading service.