* The film itself: You can clearly see the Panasonic brand name on the player in several scenes.
* Filmmakers' interviews: Director Francis Ford Coppola has mentioned the Panasonic player in interviews.
* Movie prop databases: Many databases dedicated to film props list the cassette player as a Panasonic RQ-303S.
The iconic scene where Willard plays "The Ride of the Valkyries" on this player is one of the most memorable moments in cinema history.