Poland 1924 Eagle garland, 25gr indigo, error of color (instead of red brown), h.r., well centered, with some gum staining at bottom right (caused most likely by moisture within mounting material), otherwise v.f., with 2004 Mikulski certificate. During the printing process of a sheet of 40gr indigo, a plate of 25gr was erroneously inserted in the 35th position. The error was spotted almost immediately and corrected, nevertheless a few sheets with the 25gr error went into circulation. This is considered to be one of the greatest rarities of Polish philately (Fi.189 B1, cat. 40,000zl) (Catalog value $ 12,000)
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