1: Study coin designs and mint marks for authenticity.

2: Research minting errors that increase value.

3: Compare coin weight and dimensions to authentic examples.

4: Seek professional appraisal for accurate valuation.

5: Consider historical significance and rarity of the coin.

6: Consult online resources for up-to-date market values.

7: Avoid cleaning or altering coins to preserve value.

8: Join coin collecting forums to share knowledge and acquire tips.

9: Invest in a good magnifying glass for detailed inspection.