I dont know , but I have a Rexograph machine in mint condition that my mother had. I don't know anyone else that has one. I will sell mine for $1,000. It should go in a museum. It's in mint condition.
Ditto machine ---------------------------------------------------------------- The duplicator that produces purple copies is NOT a mimeograph. It is a spirit duplicator (called alcohol process duplicator in Europe). It does not use ink. It uses a master. The master consists of a sheet of paper attached to a special (usually) purple carbon paper. It also uses spirit fluid (methanol in U.S.; ethanol in Europe)> In the US it was often called a Ditto machine. Ditto was one manufacturer of these machines. I have also heard it called a Rexograph--after another manufacturer. This type of machine was also made by A.B. Dick, Heyer, Roneo, Standard, etc.