Lot 877
  
Airmail, 1978, 31¢ Wright Brothers, ultramarine & black omitted (C92b), upper right plate block of four, with just the barest trace of ultramarine on upper right stamp, well centered, never hinged original gum, Very Fine. Only 150 pairs (three plate blocks) have been reported.
Estimate $500 - 750
Expertization: 2001 PSE Certificate (as C91c).
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| Realized $350 |
