20c Desert Plants, Block of Four, Deep Brown Omitted (1945b). Mint N.H. with bottom left corner selvage, completely devoid of "USA 20c" and English cactus names, the Latin names in Green present, fresh and Very Fine, a striking and scarce color-missing error, Datz states 20 blocks recorded, ex Floyd, with 1997 P.F. certificate, normal block accompanies

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