Offices in Tibet, 1911, 3p on 1c Ocher, Inverted Surcharge, slightly dried o.g. as all known examples have, exceptional centering amid wide margins, Extremely Fine, a choice example of this major error rarity with only two panes of twenty being printed with the inverted surcharge; with 1981 B.P.A. certificate. Scott No. 1a  $3,500. $0 (Image)