Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 359:
1911, King George V Coronation issue, plate proof or trial color proofs in black of 6c, 8c, 9c, 12c and 15c, only values of the set printed by Alexander & Son on white cards (other six stamps were produced by De La Rue on thin paper), all with top right corner margins, no gum as issued, VF and rare eye-catching unit, Minuse and Pratt #109P4, 110TC4/114TC4, Est. $300-$400, Scott #109-11, 113-14
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