unmounted mint Block of Four 1972 Machin £1 bluish black marginal imperforate block of four from the top of the sheet, unmounted mint; trivial wrinkle. Photo
unmounted mint Block of Four 1972 Machin £1 bluish black marginal imperforate block of four from the top of the sheet, unmounted mint; trivial wrinkle. Photo
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
