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U.S. Air Mail plate blocks: C-7...
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An example from the millions of items in our Price Guide:
U.S. Air Mail plate blocks: C-7 four blocks of six and two blocks of four; C-10 one block of four; C-11 PB of six with two PB numbers and a double ''TOP''...
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UNITED STATES 16 C. AIR MAIL PLATE BLOCK,[more like this]
ARROW/PLATE BLOCK U.S. AIRMAIL STAMPS,[more like this]
ARROW/PLATE BLOCK U.S. AIRMAIL STAMPS,[more like this]
COLLECTION OF UNITED STATES AIRMAIL[more like this]
COLLECTION OF UNITED STATES PLATE BLOCKS[more like this]
STAMPS: SCOTT'S UNITED NATIONS (GREEN/[more like this]
U.S. Air Mail plate blocks many multiples[more like this]
U.S. Air Mail plate blocks: C-7 four[more like this]
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