GJ.637 + 637I, 1928 blocks of 4 of 10c. printed on Austrian and ENGLISH paper (rare), MNH (+50%), excellent quality! (Image)

GJ.638, 1928 blocks of 4 of 15c. in light chestnut (normal) and yellowish chestnut (scarce), very fine quality! (Image)

GJ.639 + 639I + 639A, 1928 blocks of 4 of 18c. printed on Austrian and English paper, also the rare slate gray color, VF quality, 2 stamps in each block are MNH (+50%) (Image)

GJ.640 + 640H + 640I, 1928 blocks of 4 of 20c. printed on Austrian, Dutch and English papers, some MNH, very fine quality! (Image)

GJ.641, 1928 blocks of 4 of 24c. in 3 different shades: bright blue, dull blue and light blue, VF quality! (Image)

GJ.644 + 644I, 1928 blocks of 4 of 35c. printed on Austrian and English paper, MNH (+50%), very fine quality! (Image)

GJ.645 + 645I, 1928 blocks of 4 of 36c. printed on Austrian and English paper, VF quality! (Image)

GJ.645a, 1928 pair of 36c., one with variety "airplane on fire" (position 45), tiny hinge mark, VF quality! (Image)

GJ.648b, with "SERVICIQ" variety (position 35), VF quality! (Image)

GJ.649a, 90c. chestnut with "REPUBLICÁ" variety, VF quality! (Image)

GJ.650 + 650H + 650I, 1928 blocks of 4 of 1P. printed on Austrian, Dutch and English paper, VF quality! (Image)

GJ.651 + 651I, 1928 2 stamps of value 1.08P. printed on Austrian and English paper, VF quality! (Image)

GJ.653, 1928, 1.80P. block of 4 with variety: "CENTER SHIFTED" upwards, mint very lightly hinged (it appears MNH), VF quality! (Image)

GJ.653, 1928 1.80P. with variety: "CENTER SHIFTED" upwards, mint very lightly hinged (it appears MNH), VF quality! (Image)

GJ.660b, 1930 20c. Zeppelin with INVERTED blue overprint, VF quality! (Image)

GJ.669a, 1930 Zeppelin 1.80P. with green overprinted SHIFTED towards top left angle, mint very lightly hinged, VF quality, rare! (Image)

GJ.717a, 1931 Anniversary of the Revolution 90c., block of 4, one with "REPUBLICÁ" variety, VF quality! (Image)

GJ.718, 1931 Anniversary of the Revolution 1.80P., pair, only the top stamp with offset impression of the overprint on back, very rare variety. With some minor defects on gum, else excellent! (Image)

GJ.721U, 1932 18c. Zeppelin, block of 4 printed on AUSTRIAN PAPER, VF quality! (Image)

GJ.721, 1932 18c. Zeppelin, block of 4 with offset impression of the overprint on back, VF quality! (Image)

GJ.721A, 1932 18c. Zeppelin in LILAC color (Dutch paper), MNH (+30%), superb! (Image)

GJ.722a, 1932 90c. Zeppelin, block of 4, one with "REPUBLICÁ" variety (also MNH and signed by Kneitschel), excellent quality! (Image)

GJ.845SG, 1940 30c. Stylized airplane PRINTED ON GUM variety, excellent quality! (Image)

GJ.857, 1942 30c. Stylized airplane, block of 4 printed on end-of-roll double paper, excellent quality, rare! (Image)

GJ.860a, 1942 50c. Mercury and stylized airplane, chalky paper, block of 4, the right stamps with PARTIAL DOUBLE IMPRESSION variety (right side), the top stamps with small adherence on back, the bottom stamps MNH, VF block of 4! (Image)