5 Mark imperial yacht, peace printing, 26 : 17 perforation holes, green black / carmine red, cancelled by wheel postmark "DUALA a 7.11.13", very fine, in this quality rare stamp, signed Hunziker, Friedl, photo expertize Carsten Brekenfeld BPP "genuine and immaculate", Michel 4.800.- - provenance 64. Ebel auction 1962.