Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1275:
1918, black overprint (type 3) on perforated 15k brown lilac and blue, block of four with split tridents on left stamps, full OG, NH, VF and scarce error, ex-Dr. Zelonka, Est. $150-$200,Bulat#622 var
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