31c Wright Brothers, Vertical Pair, Ultramarine and Black Engraved Omitted, Black Engraved Omitted (C92b, C92c). Two items, better is a Mint N.H. transition block of six (C92c), left pair with engraved Black omitted, portions of Ultramarine color still present, right four stamps normal with middle pair beginning to lose its engraved colors, Very Fine and rare, ex Floyd, with 2000 P.F. certificate, second item is Mint N.H. pair with Ultramarine and Black omitted (C92b), Very Fine

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