PHILADELPHIA -- A sharp-eyed boy who noticed that the vintage radio inside gangster Al Capone's recreated Philadelphia prison cell wasn't historically accurate has delivered a replacement.

Thirteen-year-old Joey Warchal -- who collects antique radios -- took a tour of Eastern State Penitentiary and noticed that the radio in Capone's cell was wrong.

Al Capone CBS Philadelphia

The Prohibition-era mobster spent time at Eastern State in 1929 and 1930. The radio was made in 1942.

Get Breaking News Delivered to Your Inbox

The seventh-grader found a Philco Lowboy 64 from 1929 online for $300.

CBS Philadelphia reports the radios were swapped. The teen was given the 1940s radio as a token of appreciation by Eastern State. The replacement is pictured below, in the video.

The prison closed in 1971, and now operates as a museum and national historic landmark.

CBS Philadelphia notes Capone's cell is said to have featured oriental rugs, fine furniture and a cabinet radio, where he apparently listened to waltz music.