Proof Block Larger Than four 3d. black and brown, an imperforate plate proof block of six (3x2) on gummed watermarked paper; two small thins at foot otherwise fine. Very rare. Photo
Proof Block Larger Than four 3d. black and brown, an imperforate plate proof block of six (3x2) on gummed watermarked paper; two small thins at foot otherwise fine. Very rare. Photo
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
