U.S. & Worldwide Stamps & Postal History

1928 Pilsudski, 50gr green, imperforate proof in issued color, with gum, partial carmine background on back; also 1zl black imperf. plate proof on white paper (this is not to be confused with the printer's waste souvenir sheet without inscriptions, as the groundwork is completely different), the former signed Gryzewski, the latter with minor crease, with handstamped guarantee (Fi.238P6,239P9, cat. 4,500zl)
Estimate: $500