Bob Dylan and historians at PBS are in a dispute over the whereabouts of an electric guitar that the singer plugged in at the Newport Folk Festival in 1965, quite possibly the most historic single instrument in rock 'n' roll.

The New Jersey daughter of a pilot who flew Dylan to appearances in the 1960s says she has the guitar, which has spent much of the past 47 years in a family attic.

But a lawyer for Dylan claims the singer still has the Fender Stratocaster with the sunburst design that he used during one of the most memorable performances of his career.

If the authentic "Dylan goes electric" guitar ever went on the open marketplace, experts say it could fetch as much as a half million dollars.