25 Centimes 1891 Standing Helvetia, white paper, dark green, perforated 11 1/2 : 11, control mark 1 X, mint never hinged with untreated original gum, perfect condition, unsigned, top item for demanding collector, photo opinion Hans P. Renggli SBPV (1993) "Fresh colour, very good perforations, faultless condition", Zumstein 700.- CHF (Zumstein No. 67Cc)