US FIRST DAY COVERS, AIR MAIL, PLATE BLOCKS
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![(80) PLATE HOCKS & BLOCKS OF 4 [40 EACH] FDC First Day Of Issue Covers (1 of 20)](https://p1.liveauctioneers.com/10309/421181/238597728_1_x.jpg?height=282&quality=70&sharpen=true&version=1786818246)
