Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1176:
1918, error stamps with black overprint (type 3) on perforate 20k (double overprint), 50k (background shift), 70k x2 (double overprint or center shift), and two imperforate 1k x2 (double overprint or pre-printed fold broken overprint), full OG, LH or hinged, VF, expertized by J. Bulat, UPV, Dr. Seichter and etc., Est. $200-$250, Bulat #1127/32
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