Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1673:
1918, black surcharges 20pf on 10k dark blue and 40pf on 20k blue and carmine, each one cancelled on a piece with ”DORPAT” black straight line cancellation, VF, expertized by Z. Mikulski and others, C.v. $320, Mi #1-2, €400, Scott #N1-2
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