A Convention of Secessionists After the War. Caricature patriotic design on cover to North Andover Depot, Mass., franked with 1857, 3¢ dull red tied by grid cancel, red "Middleborough, Ms., Jul 22" cds, names of notable Confederate figure above caricatures; cover edge wear slightly affecting stamp, Fine, reported to be the only known used example of this humorous caricature patriotic design; with 1981 P.F. certificate. Scott No. 26  Estimate $500 - 750. $0 (Image)