W. Grabowski Collection of Poland
October 20, 2004
| Images | Description | Current Bid |
 | Lot #509 1933 International Aviation Meet - "Challenge" Issue 1933 30gr Zwirko & Wigura, imperforate horizontal pair in yellow green, unused without gum as issued, v.f. (Mi.280U) (*) Catalog #C10var Catalog Value Euro 1,000 | Price Realized $475.00 |
 | Lot #510 1933 International Aviation Meet - "Challenge" Issue 1933 30gr imperforate vertical pair in dark green, unused without gum as issued, v.f. (Mi.280U) (*) Catalog #C10var Catalog Value Euro 1,000 | Price Realized $525.00 |
 | Lot #511 1933 International Aviation Meet - "Challenge" Issue 1933 30gr, selection of 11 mostly different perforated trial color proofs, including yellow green, with or without gum, many signed Mikulski etc., rare (Fi.259, 11,000zl) P Catalog #C10P | Price Realized $7,500.00 |
 | Lot #512 1933 International Aviation Meet - "Challenge" Issue 1933 30gr, selection of 14 mostly different large die proofs, variety of colors and papers including vertically laid, watermarked and unwatermarked on wove, both the designer's and engraver's names omitted at bottom. In order to invalidatethese proofs, the perforated word "Falszywy" (in small holes) was used, many inverted, v.f. and incredibly rare assembly, only a few of each known to exist, certainly the largest holding known P Catalog #C10P | Unsold |
 | Lot #513 1933 International Aviation Meet - "Challenge" Issue 1933 30gr, selection of 8 mostly different large die proofs, variety of colors and papers including vertically laid, watermarked and unwatermarked on wove, two without the designer's and engraver's names, others withboth. In order to invalidate the proofs, the perforated word "Falszywy" (large holes) was used, many inverted, v.f. and rare group P Catalog #C10P | Unsold |
 | Lot #514 1933 International Aviation Meet - "Challenge" Issue 1933 30gr, selection of five different large die proofs, variety of colors, all on watermarked wove paper, all with the designer's and engraver's names, v.f., without the invaliding perforations, very rare P Catalog #C10P | Unsold |
