Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 609:
Description
SELECTION OF SURCHARGED ENVELOPES: 1879-81, 9 items (8 different), representing complete of the 15th Auxiliary issue, including 7k/10k (140×110) and 7k/20k, only a handful of those were officially sold, all are unused, some ageing on duplicate envelope of 7k/8k (140×110), VF, Standard Cat. #SC33-35, SC036, C.v. $810, Est. $400-$500
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