Baseball cards are appraised based on many different criteria beyond the player on the card. Factors such as condition, errors, scarcity, and print variation can impact the price and value. 

Player

Hall of Fame cards are typically worth more than common player cards, though there are exceptions. 

Condition

The condition of the baseball card affects the value of any card, regardless of the rarity. The condition of the card is determined by looking at the corners, edges, centering, and surfaces for wear and tear.

Print Year

Generally, the older a baseball card is, the more value it will have. For instance, a common baseball card from 1912 will be worth more than a common card printed in 1970.

Errors

When baseball cards are printed, there are often errors. These errors can often lead to price increases depending on the rarity. There are two types of errors in baseball cards, uncorrected errors and corrected errors.

Scarcity

Before the 1980s, the production of baseball cards was limited. As a result, cards before this time are worth more due to their age and their scarcity.