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7/1950 express airmail to US using 40+80pr UPU tete-beche pair stamps

1950 UPU / rates & routes: 27-7-1950 express airmail cover from HOLON to CHICAGO franked 120pr at the FA-2a postage period rate (80pr letter + 40pr express) using 40+80pr tete-beche pair (Ba27+28) tied by single full strike of Holon postmark; slit open at top, some edge creases; very fine; rare rate & franking, Estimated value $250+