Lot 20245 – 1929 Pioneers 14k blue grey, mint nh single, showi

1929 Pioneers 14k blue grey, mint nh single, showing the rare perforation 12 1/4 : 12 : 10 3/4 : 12, very fine & scarce, cert. Mandrovskiy (Mi. 364D, Standard 227, Liapin 292A, Zverev & Gilmanov 230C, €600), plus 10k nh perforation 10 and the regular perforation 12 1/4 for both values (hinge remainder resp. hinge trace for these 2), fine group