(Cameo) Mass, Percival & Maas, Engravers, Die Sinkers & Embossers of Cards, Envelopes, Labels, & c., blue embossed cameo corner card on cover to Lexington, Va., franked with 1851, 3¢ dull red tied by Philadelphia, Pa. cds, 1853 docketing at right, Very Fine, a very rare cameo from this Philadelphia cameo maker, with only 2 examples known. Scott No. 11  Estimate $200 - 300. $0 (Image)