United States #C129 40¢ Air Post - William Piper, Aviation Pioneer Mint Plate Block
Mint condition, never hinged.
1991 40¢ Air Post - William Piper Mint Plate Block
$7.50
1991 40¢ Air Post - William Piper Mint Single
United States #C129 40¢ Air Post - Aviation Pioneer William Piper Mint Single Mint condition, never hinged.
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1991 40¢ Air Post - William Piper Mint Sheet
United States #C129 40¢ Air Post - Aviation Pioneer William Piper Mint Sheet of 50 Mint condition, never hinged.
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1991 50¢ Air Post - Harriet Quimby Mint Plate Block
United States #C128 50¢ Air Post - Harriet Quimby, Pioneer Pilot Mint Plate Block Mint condition, never hinged.
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1991 50¢ Air Post - Antarctic Treaty Anniversary Mint Plate Block
United States #C130 50¢ Air Post - Antarctic Treaty 30th Anniversary Mint Plate Block Mint condition, never hinged.
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1991 50¢ Air Post - Americas Issue (Bering Strait) Mint Plate Block
United States #C131 50¢ Air Post - Americas Issue (Bering Strait) Mint Plate Block Mint condition, never hinged.
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