Last week, the Balitmore-based School Sisters of Notre Dame sold a rare Honus Wagner baseball card, with condition issues, in a post-auction transaction to a Philadelphia-area cardiologist for $220,000.

The T206 series of the Honus Wagner card, produced between 1909 and 1911, is considered the "Holy Grail" of baseball cards and is one of the most sought-after sports collectibles. About 60 cards are known to exist and in 2007 a near-mint-condition T206 Wagner card sold for $2.8 million, the highest price ever for a baseball card.

One of the sisters had inherited the card and the nuns consigned it to Heritage Auctions in order to raise funds for their ministries.

After a buyer failed to pay for the card following the auction, Dr. Nicholas DePace, an underbidder, purchased the card. He plans to open a non-profit sports museum, featuring his multimillion-dollar collection, in New Jersey next year.