Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 793:
1936, Matanzas issue, 1c-50c, complete set of eight trial color proofs, each one with a punch at bottom left (over the value) and black overprint ”Waterlow and Sons Ltd. Specimen”, full OG, NH, VF and scarce, Est. $300-$400, Sc. # 324-31
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