Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 1051:
1908, King Carol I, imperforated plate proof in red with no value indicated, proposed for 50b denomination, right sheet margin block of four, trace of die sunk at right selvage, no gum as issued, NH, VF and rare in block, Est. $300-$400 , Sc. #214
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