Auction # 2503 ARGENTINA: Special February auction

GJ.31, 15c. blue WITHOUT watermark and imperforate, additional 6th printing, semi-clear impression, rare example with 2 cancels: dotted and "Certificado" of Buenos Aires. It has a thin on back, good front, very interesting and only one known with this double cancellation, signed on back by Victor Kneitschel, with Alberto Solari certificate, good opportunity!