1901-04 Perforation 11¾ 40c. grey, Zumstein 76F,

marginal block of 4 from the upper-left corner of the sheet, Control mark in the corner, well-centred, superb colour, the stamps are unmounted original gum. EXCEPTIONAL QUALITY. SBPV/ASEP Hans P. Renggli Certificate 1994 (20,366)