Sotheby 's to auction only two of the earliest versions of Sotheby 's . Document expected to go for at least $ 20 million to $ 30 million . Charter mandated king to cede certain basic rights to citizens . Redden bought this version in 1297 .
Sotheby 's to auction one of the earliest versions of the Magna Carta . Document expected to go for at least $ 20 million to $ 30 million . Charter mandated king to cede certain basic rights to citizens . Ross Perot bought this version in 1984 .