The signature used by Marxist revolutionary Che Guevara from 1960-1967. Although his legal name was Ernesto Guevara, he simply signed his documents with his nickname "Che" (this included the Cuban currency when he was President of the National Bank). Sometimes this variation is shown with the "C" connected in a full circle, other times with it divided like shown here.
Own work based on: CheGuevaraSignature.jpg
Original:  Redthoreau Vector:  Gringer