25c Octave Chanute, Vertical Pair, Ultramarine & Black Engraved Omitted (C94b). Mint N.H. transition block of four, the right vertical pair the error, the left vertical pair missing part of its engraved colors but otherwise normal, top error stamp with narrow gum skip, Very Fine and extremely rare, Datz states only 5 pairs are reported and adds that transition multiples such as this sell for a premium, with 1984 A.P.S. certificate

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