1. Rarity: Coins that were minted in limited numbers or have a unique minting error are typically more valuable. The fewer there are, the higher the demand among collectors.
Historical Significance: Coins that mark important historical events or periods tend to be more valuable. Bicentennial quarters, which commemorate the 200th anniversary of the United States, fall into this category.
Condition: The state of preservation of a coin greatly affects its value. Coins in mint or near-mint condition are worth more than those showing signs of wear and tear.
Provenance: The history of the coin's ownership can also add to its value. Coins owned by famous collectors or found in historically significant locations can fetch higher prices.
Proof Coins: These are specially minted for collectors and often have a higher value due to their limited production and superior quality.
High-Grade Specimens: Coins graded MS67 or higher by professional grading services like PCGS or NGC can command premium prices.