Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on perforated 5k claret, full OG, LH, VF, Z. Mikulski certificate (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on perforated 15k brown lilac and blue, full OG, LH, VF, expertized by Z. Mikulski, his certificate is included (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on imperforated 15k brown lilac and blue, a single with enlarged margins on the right and at the bottom, full OG, LH, VF, expertized by Z. Mikulski, Soviet Philatelic and Sanabria guarantees (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on perforated 20k blue and carmine, full OG, LH, VF, Z. Mikulski certificate (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on perforated 35k red brown and green, full OG, LH, VF, Z. Mikulski certificate (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k on perforated 50k brown and green, full OG, LH, VF, Z. Mikulski certificate (Image)

Air Post stamps. 1923, red Airplane surcharge ''Vladivostok. 1923'' 20k over definitive stamp of Siberia with black surcharge 35 (k) on 2k green, full OG, LH, VF, expertized by Z. Mikulski, his certificate is included (Image)

Air Post stamps. COLLECTION ON LINDNER HINGELESS PAGES: 1923, 45 mint stamps, including genuine surcharges on perforated and imperforated 1k and perforated 15k (all expertized, minor gum toning), 23 stamps with Soviet Philatelic guarantees on reverse, but in our opinion nicely made reprints, and group of 19 obvious forgeries, nice quality unit overall, full OG, NH or LH, F/VF (Image)