Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 291:
1882-85, black ”O S” overprint on Queen Victoria 2p blue, perforation 11×12, watermark Large Crown and NSW, block of four with a gap of horizontal perforation, bottom right stamp with 8.5mm instead of 7mm space between ”O” and ”S” (position R.4/4), large part of OG, previously hinged, VF and rare multiple, NPC certificate, SG #O21c, Est. $400-$500, Scott #O13 var
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