Series 591 (May 26, 1961-January 6, 1964 printed by Forbes Lithograph Manufacturing Company) This was the last series to be printed by a private contractor. All of the following series were printed by the Bureau of Engraving and Printing. This change came about during the bidding for the printing of Series 591. Tudor Press was denied the contract for Series 591 because of the poor quality of Series 541. Forbes used a unique-to-MPC specimen format for this series. These specimens have zero serial numbers with prefix and suffix letters as well as a SPECIMEN hand stamp on each note. All PCGS Graded: 5 Cents 58PPQ; 10 Cents 66PPQ; 25 Cents 64 Apparent Minor Mounting Remnants on Face at Right; 50 Cents 67PPQ; $1 55PPQ; $5 58PPQ; $10 58PPQ.，From the Paymaster Collection.
