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Straight Edges at Left and Bottom Sides ![]() Horizontal Spacing Between "O" and "B": 2.0 mm versus 3.0 mm Distance Between 2 Points
Extremely Scarce in Mint State |
![]() National Research Council official mail, 4c Double Rated Domestic Mail franked with Positions 91 and 92 pair (enlarged below). |
![]() Positions 91 and 92 Extremely Rare on Cover |
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