Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 563:
Description
1921, red instead of black and vice versa trial overprints ”Plebiscite. 20 mars. 1921” on 15m violet, 20m blue, 25m dark brown, 30m orange and 40m olive green, all mounted on a small piece and attached to Dr. H. Mueller certificate (each stamp in addition with his handstamp), usual centering, VF and rare, only 300 such sets with reversed overprint colors were printed and 50 of those were destroyed, Est. $300-$400, Scott #33-37 var
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