Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1760:
1933-38, Prince Francis I, 3fr violet blue and 3fr black, the last one is the mourning issue, the last one with margin at left, full OG, NH, VF, C.v. $271, SBK #120, 142, CHF380, Scott #114, 152
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