Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 678:
1933, Prince Francis I, 3fr violet blue, size 24x30mm, unfolded block of four, full OG, NH, VF, E. Diena certificate, C.v. $1,000++, SBK #120 I, CHF1,400 as singles, Est. $250-$300, Scott #114
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