1934, 30 mint stamps, including one block of four (20k - no watermark), representing one complete set on watermarked and three sets on paper without watermark, mainly full OG (some regummed), NH or LH, F/VF (Image)

October 4-6, 1934, Pioneer Flight registered cover from Moscow to Istanbul, franked by 50k dark blue on watermarked paper along with three other adhesives, delivered by three connecting flights, Moscow-Berlin (4.10.), Berlin-Vienna (5.10.) and Vienna-Istanbul (6.10), all appropriate confirmation and arrival markings on front and reverse, arrived to Istanbul within three days, mostly VF and scarce cover (Image)

1934, 80k purple, a single with perforation 10x14x14x14, printed on watermarked paper, rough perforation at top as always on these errors, neat Moscow CTO with full OG, VF and rare, N. Mandrovski certificate (Image)

1934, 10k green, horizontal pair printed on paper without watermark, imperforated between stamps, CTO with full OG, VF, C.v. $1,250 (Image)