1: Rare coins must typically be at least 50 years old.

2: Antique coins must have historical significance to be valuable.

3: Coins with errors or unique markings can also be rare.

4: Condition and rarity both play a role in coin value.

5: Rare coins can be valuable even if they are not ancient.

6: Collector demand can also drive up the value of coins.

7: Researching coin values can help determine rarity.

8: Consulting with coin experts can provide valuable insights.

9: Investing in rare coins can be both rewarding and profitable.