PBS’ now-legendary show Antiques Roadshow has found its largest collection of sports memorabilia, which would make any baseball fan drool. The collection includes Boston baseball cards from the 1870s.

The collection came to the show during a taping in New York. Producer Marsha Bemko told The Associated Press that the collection has been valued at $1 million. The identity of the owner was not revealed.

The owner received them from her great-great-grandmother, who ran a boarding house in Boston. The players, who played for the franchise that is known today as the Atlanta Braves, lived at the home in 1871 and 1872.

Antiques Roadshow star Leila Dunbar said that the “crown jewel” of the collection is a letter to the great-great-grandmother. It includes three notes from future Hall of Famers Albert Spalding and brothers Harry and George Wright.

Amazingly, this was the show’s first stop in New York since 2001, reports The Wall Street Journal. The show, which has been on for 19 years now, features the hosts traveling around the country, appraising items that owners often have no idea what they are worth. The New York session will result in three episodes, which will air next year.