According to experts, there are three fundamental criteria that determine whether a coin is of significant value:
Key Dates: Particularly, the prints from 1909S, 1914D, and 1955 are in high demand. The 'double die' error in 1955 makes the coin legendary among numismatists.
Material Misprints: During the Second World War in 1943, coins were made of steel to conserve copper. However, a few 1943 pennies were mistakenly struck in copper, making them among the most valuable coins today.
1922 'No D' Prints: Despite being minted in Denver, coins with the 'D' letter worn off due to die wear are fetching record prices at auctions.
1909S VDB Signature: This series, bearing the initials of designer Victor David Brenner and minted in limited quantities in San Francisco, is known as the 'key piece' of collections.
Condition and Originality: The wear and tear of the coin and the natural patina (layer formed over time) directly affect its price.