The value of old baseball cards can vary greatly depending on many factors like the player, year, condition of the card, and more. Some key things that impact the value include:

Year of issue – Generally, the older the card the more valuable it will be. Early 1900s cards from the tobacco era before modern cardboard cards are extremely rare and valuable. 1910s and 1920s tobacco cards can sell for tens of thousands. 1930s-1950s cardboard cards start getting more common but top star rookie cards still command high prices.

Condition – A card’s condition or state of preservation is arguably the biggest determiner of value. Near mint and gem mint cards in the best condition bring the highest prices. Even minor flaws or wear can drastically cut into value. Heavily played cards may only be worth a few dollars even for rare early issues.

Player featured – Cards featuring iconic stars from baseball’s early eras like Babe Ruth, Ty Cobb, Honus Wagner are almost always the most valuable, especially their rare early rookie cards. But all-time greats from other eras like Mickey Mantle, Ted Williams, Ken Griffey Jr. also have highly valuable rookie cards. Less prominent but still star players have value proportional to their career stats and accomplishments. Unknown or bench players have little value regardless of era.

Rarity – Beyond just the year issued, some specific cards were printed in far smaller quantities than others, making them exponentially rarer. Honus Wagner’s infamous 1909-1911 T206 tobacco card is iconically rare with perhaps only 50-200 known to still exist today in all grades. Finding any truly rare variant can yield a six or even seven figure auction price.

To summarize typical valuations across different eras:

Pre-1930 tobacco cards: Even routinely played condition examples from the earliest 1890s-1910s tobacco issues can fetch thousands due to their frontier status as the first mass-produced baseball cards. Gems can sell for five or six figures.

1930s-1950s cardboard cards: Common players in played condition may only be $5-25 but mint condition rookie stars could achieve $500-2500. True gems of icons could reach five figures or greater.

1960s: Condition dependent but $5-100 for stars, higher for true mint examples. Rare short prints upwards of $1000.

1970s: $1-50 typical but rookie stars like Reggie Jackson might reach $200-1000 in top grades.

1980s: Under $20 usually but stars over $100 in mint. Rarest rookie gems over $1000.

1990s+: Bargains of $1-10 outside rare, mint exceptions of biggest stars as values only recently started rising again on modern issues.

Naturally, truly exceptional finds in impeccable condition or depicting historic events can break all norms and bring record prices exponentially higher through auction. But Those are the typical value ranges collectors can expect when looking to buy, sell, or have old baseball cards appraised depending on the specific details. Condition and pedigrees are everything in determining final price.