Limited Edition Proofs: Coins that were minted in extremely limited numbers for collectors, often with superior quality and detail.
Significant Mint Errors: Coins with dramatic and rare minting errors, such as off-center strikes, double strikes, or incorrect planchets.
Historical Context: Coins associated with major historical events or periods, adding to their collectible appeal.
High Grades: Coins that are among the highest graded by professional grading services, indicating exceptional preservation.
Special Commemorative Issues: Coins released as part of special commemorative sets with limited mintages and unique designs.
While the headline values of $200 million and $30 million might seem exaggerated, they highlight the fascinating potential of coin collecting.