Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 959:
1921, cover to USA, franked by five pictorial surcharged stamps, four of which are bearing double surcharges, vertical pair in addition with triple bars not listed in Scott, all tied by Monrovia ds, mostly VF, Scott #176b, 179c, O112b
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