I would contact Southebys auction house in New York.
Since 1985, the voice of Donald Duck has been performed by Tony Anselmo, who was trained by Clarence Nash, the only other person who has ever done the voice. The voice of Donald Duck is Clarence Charles "Ducky" Nash or just Clarence Nash. He was an American voice actor born in the rural community of Watonga, Oklahoma. In order to honor him, there is a street named after him in that town.
That would be Donald Duck!
The cast of Donald Duck and his Companions - 1960 includes: Clarence Nash as Donald Duck
The cast of The Trial of Donald Duck - 1948 includes: Clarence Nash as Donald Duck
Clarence Nash voiced Donald Duck and the frog from Bambi.
Donald Duck was originally voiced by Clarence Nash until his death in 1985. Donald is currently voiced by Tony Anselmo.
The cast of Donald Duck Goes West - 1965 includes: Pinto Colvig as Goofy Clarence Nash as Donald Duck
Clarence Nash voiced Donald Duck and the frog in Bambi.
Clarence Charles "Ducky" Nash
The cast of Donald Duck Visits Lake Titicaca - 1955 includes: Clarence Nash as Donald Duck Fred Shields as Narrator
The cast of Dude Duck - 1951 includes: Clarence Nash as Donald Duck
The cast of Daddy Duck - 1948 includes: Clarence Nash as Donald Duck