Baseball cards are a beloved hobby for many people around the world. Part of the enjoyment of collecting cards is the hunt for rare variations and mistakes amongst the mass produced cards. Throughout history, errors have happened during the printing process that create one-of-a-kind cards cherished by enthusiasts. Here is an overview of some of the most famous and valuable error baseball cards known to collectors.

1909 T206 Honus Wagner: Perhaps the holy grail of baseball cards, the ultra-rare T206 Honus Wagner is by far the most valuable trading card in existence. It’s believed that a small number of cards were printed with the reverse image misplaced, showing Honus Wagner’s face on the back instead of the front. Only a handful are known to exist today, making them the rarest Wagner cards and worth millions of dollars to the right collector.

1948 Leaf Babe Ruth: Considered the second most valuable baseball card after the normal T206 Wagner, rumors persist of an error 1948 Leaf Babe Ruth card that was found without any printing on the front. Unverified, but the card is part of stories swapped by collectors due to the unbelievable nature of a completely blank error Ruth card.

1955 Topps Willie Mays: Usually found with a standard design on the back, it’s been documented that less than five 1955 Topps Willie Mays cards were printed incorrectly to instead show Mays on the front and back. The dual Mays image is almost impossible to find in circulation, with just a couple confirmed to still exist in collections.

1969 Topps Reggie Jackson: One of the biggest rookie card stones for collectors is the 1969 Topps Reggie Jackson. A small population of cards are thought to have been missorted, showing Jackie Hernandez on the front where Jackson’s photo and statistics should be. The error creates an extremely rare first year card for one of baseball’s all-time great sluggers.

1972 Topps Nolan Ryan: Considered the key card for completing a full rainbow set of the famed 1972 Topps design, less than 10 examples are known to exist of the black-on-black error variation that sees Nolan Ryan’s name, position, and stats completely omitted in black ink. The stealth-like qualities make it extremely difficult to discern from the standard issue.

1983 Fleer Gary Carter: An incredibly minor statistical error, but one that created a valuable collectors card – A small subset of the 1983 Fleer Gary Carter rookie cards mistakenly listed his position as 3B instead of C. The position error makes an otherwise common rookie card highly sought after by detail-oriented collectors.

1987 Topps Mark McGwire: One of the biggest rookie cards of the modern era, but an elusive error version gained notoriety in the late 1980s. Several ’87 McGwire rookies were found with strangely blurred photos, suspected to be an isolated printing flaw. Condition sensitive and exceedingly rare, the blurred McGwire rookie brings top dollar.

1992 Studio Steve Avery: One of the most visually dramatic mistakes involves a small print run of the popular1992 Studio Steve Avery rookie card. Several boxes contained cards where Avery’s face was entirely missing from the photo, leaving a blank white space that is jarring to view. Replacing the emerging star’s likeness with blank space creates an unsettled feeling for collectors.

1997 Collector’s Choice Jeter/Piazza: Arguably one of the most financially impactful errors involved swapping the photos of two all-time great rookies – Derek Jeter and Mike Piazza. A small subset of 1997 Collector’s Choice rookie cards put Piazza’s photo where Jeter’s should be, and vice versa. The error elevates otherwise ordinary rookie cards into six-figure status for serious collectors.

2000 Upper Deck Curt Schilling: Amongst modern cards, the elusive ‘Smoking’ Curt Schilling error from 2000 Upper Deck stands out. More than a dozen boxes had Schilling cards inserted without the trademark cigar smoke silhouette behind his head. Lacking the iconic smoke missing makes it one that collectors know to look for when breaking wax from that year.

In Summary: Major errors amongst the most high-profile players and rookie cards garner attention from both casual and serious collectors alike. Their very rarity and inability to replace make them incredibly desirable, with values far greater than standard issue cards in many cases. While finding such mistakes requires luck, hearing tales of the errors continues fueling enthusiasm for the endlessly surprising world of misprints in sports card collecting history.