A lot of the things that make a baseball card valuable make sense -- better condition translates to the higher prices, for example, and cards depicting hall-of-famers yield more than cards immortalizing choke artists.
But just as many factors make no sense at all. Relatively common cards can sell for more than rarities in the same series. Pristine selections can sell for multiples more than the same card with a barely perceptible blemish. A particular card might develop such an interesting story that aficionados can't help but put in a bid when it arrives on the auction block. "It's all about what collectors perceive as being desirable," says Joe Orlando, president of Professional Sports Authenticator, an organization that inspects sports collectibles for authenticity and grades their condition [source: Orlando].
And collectors are willing to pay a lot for what they desire. One key obstacle to definitively listing the world's most expensive baseball cards is the fact that many private collectors make purchases without the particulars of the transaction ever being published -- and the prices they pay can be far more handsome than any of the figures made public. "I can say for a fact that in the last year, more big records -- six- and seven-figure records -- have been set privately than publicly," Orlando says [source: Orlando].
So, with these caveats in mind, let's look at five of the most expensive baseball cards in the world.
1955 Topps Roberto Clemente
Roberto Clemente was a right fielder with the Pittsburgh Pirates known for a batting prowess matched by his benevolence. He scored 3,000 hits in the course of his career and led the team to a 1971 World Series victory, but he then died in a plane crash the following year while delivering supplies to earthquake victims in Nicaragua.
In May 2012, a 1955 Topps Roberto Clemente No. 164 card -- Clemente's rookie card -- sold for $432,690. The card was part of a lot made available by Dmitri Young (a 13-season Major League veteran himself) that sold through SCP Auctions for more than $2.4 million [source: Sports Collectors Daily].
Professional Sports Authenticator grades card condition on a scale of 1 through 10, with 10 representing mint, perfect condition. This particular Clemente rookie card is the only card to receive a PSA 10 rating out of more than 2,860 submitted to PSA over the years [source: SCP Auctions]. It also illustrates just how much condition correlates with sale price: The same card graded as a PSA 8 is worth only about $6,000, Orlando says [source: Orlando].
1914 Baltimore News Babe Ruth
Babe Ruth is an essential addition to the list. This card was issued in 1914, just after the fresh-faced rookie was signed to the Baltimore Orioles, then a minor-league team. The cards were issued in either red-and-white or blue-and-white color schemes with a game schedule printed on the back. Only 10 of these cards are believed to exist. A few months after this card was issued, Ruth was traded to the major-league Boston Red Sox and began building his legend as one of the MLB's greatest homerun hitters.
Sportscard Guaranty graded this card using a scale of 100. While it garnered a relatively low grade of 40 (no high-grade versions are believed to exist), the card garnered 59 bids during a rare auction appearance in 2008. It sold through Robert Edwards Auctions for $517,000 [source: Sports Collectors Daily].
1909-1911 T206 Eddie Plank
Eddie Plank was a Hall of Fame pitcher who spent the bulk of his career with the Philadelphia Athletics, pitching eight 20-win seasons along the way and becoming one of the few southpaws to win 300 or more games in his career.
Issued by the American Tobacco Company over the span of three years, the 1909-1911 T206 series is one of the most popular sets in the sport. Plank's card is the more rare standard entry from the set: Only 63 have been graded by PSA. (Only the Joe Doyle error card, which falsely proclaimed the New York Highlanders pitcher as affiliated with the New York Nationals, is more rare. A PSA 3 version of that card sold at Robert Edwards Auction in May 2012 for $414,750 [source: Professional Sports Authenticator].) Potential reasons for this scarcity could be because of a broken printing plate, an aversion to tobacco products, or a possible demand by Plank for more money for the use of his image. Whatever the cause, a PSA 8 is the highest-rated survivor from the set. Orlando says a PSA 7 sold privately for at least $700,000 in summer 2012 [source: Orlando].
1952 Topps Mickey Mantle
Mickey Mantle's 18-year career with the New York Yankees led to 12 World Series appearances and a record for most home runs hit during the World Series. His 1952 Topps card is poised to set a record of a different kind.
The Topps card is often mistaken as Mantle's rookie card -- that distinction goes to the Mantle card issued by Bowman Gum in 1951. Of the more than 1,000 1952 Topps Mickey Mantle cards that have been graded by PSA, only three PSA 10 versions exist. A mint-condition card hasn't come to auction since 1997, when it sold for $121,000 and set a record for the card. A PSA 9 version of the card sold for $282,587 at an auction in 2008 [source: Professional Sports Authenticator].
While these figures are small compared to other entries on the list, a PSA 10 1952 Mantle Topps card has the potential to eclipse every other sale on the list. Orlando says he knows of private, million-dollar offers that have been rejected. The fact that this card rarely becomes available has only whet collectors' appetites. "There's so much built-up demand for that card," he says. "Once one of them hits the market [in a PSA 10], who knows what it could generate? I would bet the farm that it would go well north of seven figures if it popped up today" [source: Orlando].
1909-1911 T206 Honus Wagner
The T206 Honus Wagner card is the most coveted entry on the list. Wagner was a shortstop for the Pittsburgh Pirates, and was one of the first five players inducted into the Baseball Hall of Fame. This card was pulled from circulation shortly after approximately 200 made it to market -- like Eddie Plank, some believe Wagner either didn't want to support tobacco use or wanted more money.
A PSA 8 Honus Wagner -- the highest surviving grade of the card -- passed through many hands, including those of hockey star Wayne Gretzky, before reaching Ken Kendrick, owner of the Arizona Diamondbacks baseball team. In 2007, Kendrick purchased a PSA 8 for $2.8 million, the highest recorded price ever paid for a baseball card [source: Jacobs].
In July 2012, the story of the T206 Honus Wagner card took an interesting turn. A federal investigation resulted in several fraud charges against sports memorabilia dealer Mastro Auctions, and led to allegations that they trimmed the edges of the Wagner card purchased by Kendrick to improve its appearance. Some experts say trimming should reduce the card's value, while others say its value might have actually increased by as much as $500,000 [source: O'Keeffee]. The card remains the best-condition T206 Wagner available, plus it has a compelling story. And in this hobby, a good story counts for a lot.
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- CBSSports.com. "Rare 1909 Honus Wagner baseball card could fetch $1.5 million." Mar. 26, 2012. (July 25, 2012) http://www.cbssports.com/mlb/story/18060916/rare-honus-wagner-card-could-fetch-15
- Finkel, Jan. "Eddie Plank." Society for American Baseball Research. (July 25, 2012) http://sabr.org/bioproj/person/339eaa5c
- Jacobs, Deborah. "Eight Ways to Make Collecting Pay Off." Forbes. June 25, 2012. (July 26, 2012) http://www.forbes.com/forbes/2012/0625/investment-guide-12-collecting-robert-byers-hobbyist-reward.html
- National Baseball Hall of Fame and Museum. "Clemente, Roberto." (July 25, 2012) http://baseballhall.org/hof/clemente-roberto
- National Baseball Hall of Fame and Museum. "Mantle, Mickey." (July 25, 2012) http://baseballhall.org/hof/mantle-mickey
- National Baseball Hall of Fame and Museum. "Plank, Eddie." (July 25, 2012) http://baseballhall.org/hof/plank-eddie
- National Baseball Hall of Fame and Museum. "Ruth, Babe." (July 25, 2012) http://baseballhall.org/hof/ruth-babe
- National Baseball Hall of Fame and Museum. "Wagner, Honus." (July 29, 2012) http://baseballhall.org/hof/wagner-honus
- Orlando, Joe. President, Professional Sports Authenticators. Personal interview. July 23, 2012.
- O'Keeffee, Michael. "Card experts: Gretzky T206 Wagner likely worth more now that feds say it was trimmed." New York Daily News. July 26, 2012. (July 29, 2012) http://www.nydailynews.com/sports/i-team/famous-honus-wagner-card-increases-500-000-federal-indictment-alleges-card-trimmed-article-1.1122742
- Professional Sports Authenticator. "Memory Lane Auction Shatters Records." June 5, 2008. (July 26, 2012) http://www.psacard.com/articles/article_view.chtml?artid=5363&type=1
- Professional Sports Authenticator. "T206 Wagner Sells for $651,750; Babe Ruth Rookie Card $142,200; Famous T206 Doyle Hammered Down at $414,750; Countless Baseball Card Auction Records Set at REA!!!" June 18, 2012. (July 25, 2012) http://www.psacard.com/articles/article_view.chtml?artid=7295
- SCP Auctions. "Lot #11: 1955 Topps #164 Roberto Clemente Gem Mint PSA 10 (1/1) - Dmitri Young Collection." May 19, 2012. (July 25, 2012) http://catalog.scpauctions.com/LotDetail.aspx?lotid=19111
- Sports Collectors Daily. "Babe Ruth Rookie Card Fetches $517,000." May 4, 2008. (July 29, 2012) http://www.sportscollectorsdaily.com/babe-ruth-rookie-card-fetches-517000/
- Sports Collectors Daily. "Dmitri Young Rookie Card Collection Brings $2.4 million." May 19, 2012. (July 26, 2012) http://www.sportscollectorsdaily.com/dmitri-young-collection-of-psa-10-rookie-cards-brings-huge-money/
- Sports Collectors Universe. "Ultra Rarities: T206 Eddie Plank." Oct. 24, 1997. (July 26, 2012) http://www.psacard.com/articles/article_view.chtml?artid=244&type=1
- Thompson, Teri; O'Keeffee, Michael. "Bill Mastro and two partners indicted on fraud charges stemming from massive sports memorabilia scam, including altering famous Honus Wagner card." New York Daily News. July 25, 2012. (July 29, 2012) http://www.nydailynews.com/sports/i-team/bill-mastro-partners-indicted-fraud-charges-stemming-massive-sports-memorabilia-scam-article-1.1121644