British Guiana 1856, 4¢ black on magenta. Tied on large piece by "Demerara, Jy 22, 1856" town postmark, light crease and a few covered surface scrapes, F.-V.F. appearance, still an attractive example of this scarce stamp; with 1971 B.P.A. certificate. Scott No. 14. SG No. 24  £8,500 ($13,345). $0 (Image)