unmounted mint Block of Four 1952 U.P.U. set of twelve, each in a corner block of four, unmounted mint. C.O.B. 880-891, B.F. 48,000
unmounted mint Block of Four 1952 U.P.U. set of twelve, each in a corner block of four, unmounted mint. C.O.B. 880-891, B.F. 48,000
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
