Lot
798 
(Stationery - Pencil) Government Duplex Self-Sharpening Pencil Sharpener, 2 covers showing similar Self-Sharpening Pencil Sharpener; 1895 use in black on 2¢ Columbian entire and 1896 use in green on cover franked with 2¢ carmine, Boston, Mass. machine postmarks and illustrated ad text on reverses, Very Fine. Estimate $100 - 150.