The value of a signed baseball card largely depends on several factors, such as the player who signed it, the card company and year it was printed, the quality and condition of the card, and the significance of the autograph to collectors. The more famous and accomplished the player, the older and rarer the card is, and the higher grade it receives, the more valuable it will be. There is quite a wide range in potential prices for signed baseball cards.

On the low end, a common modern signed card from a current average MLB player might fetch around $20-50. This would be for a very obtainable and low-valued signature on a common, mass-produced card in lower grades. A signed rookie card or early career card of a star player even from the past 20-30 years could range from $100-500, depending on demand, condition, and the player’s career accomplishments and stats.

Moving into the past few decades, signed cards from the 1980s-1990s of known Hall of Famers or all-time great players start increasing substantially in value. In the $500-1,000 range would be attainable signed rookie or star cards from that era of players like Cal Ripken Jr., Wade Boggs, Tony Gwynn, Greg Maddux, etc. Clean signed rookies or iconic cards from this time period of true legends like Ken Griffey Jr., Frank Thomas, or Barry Bonds could bring $1,000-3,000 depending on all factors.

The further you go back historically, the higher prices exponentially increase, especially for the oldest and most coveted signed vintage cards. Signed rookie cards or important early career cards from the 1960s-1970s of all-time position players like Hank Aaron, Willie Mays, Mickey Mantle, or pitchers like Sandy Koufax regularly sell for $5,000-$15,000 when higher graded and condition is excellent. Extremely desirable vintage signature cards can surpass even those prices.

A properly graded and authenticated signed rookie card of Babe Ruth from the 1910s-1920s would now be worth well over $100,000. Perhaps the highest valued vintage signed card is a T206 Honus Wagner, considered the most iconic and valuable trading card of all time. In pristine conditioned and bearing his true autograph, one of these ultra-rare early 1900s cards would easily sell at auction for over $1 million, potentially reaching the multi-million dollar range.

Certain modern career accomplishment or milestone cards signed also garner big prices if the player is a legend. A signed copy of Barry Bond’s 756th career home run ball card could hit $25,000 due to the historical significance of the record-breaking event. Rare 1-of-1 serial numbered patch cards featuring swatches of jerseys worn during a World Series win by legends like Derek Jeter have gone for over $50,000 with signatures.

Of course, there are always unpredictable outliers. A signed rookie card of relatively unknown or unsuccessful players essentially has little added value over an unsigned copy. Conversely, a card bearing the perfect storm of an indispensable signature, impeccable condition and uniquely important historical context could blow past even expectations. Ultimately, the collectibles market is driven by passion and demand rather than precise science. Condition, provenance research and second opinions from trusted graders remain crucial in determining investment worth for high-end signed cards.

While the price range is enormous, most common signed modern baseball cards will sell for under $100. Attainable vintage and star player autos can reach the hundreds to low thousands. Iconic Hall of Famer rookie cards rise into the $5,000+ range. And the most coveted one-of-a-kind vintage cards bearing names like Wagner, Cobb or Ruth have the potential to shatter auction records over $1 million. Between those bookends, the value is determined mainly by era, player significance, and card quality – but the memorabilia market remains unpredictable. Hope this lengthy overview provided useful context on pricing dynamics for signed baseball cards!