Air Mail unmounted mint -- 50p.indigo and green, a superb unmounted mint block of four from the top of the sheet. Very rare. S.G. 742, £6000. Photo
Air Mail unmounted mint -- 50p.indigo and green, a superb unmounted mint block of four from the top of the sheet. Very rare. S.G. 742, £6000. Photo
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
