Liberia, 1936, 6¢ on 2¢ Violet, Surcharge Inverted, bottom stamp in vertical pair with normal, without gum, Very Fine, a very rare inverted surcharge variety; signed H. Bloch, Forester, Calves, with 1983 Friedl certificate. Scott No. C1 var., C1  Estimate $750 - 1,000. $0 (Image)