Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 830:
OCCUPATION AZIRBAYEDJAN: 1917(c), black, blue or red handstamped diagonal overprints on perforate 2k-70k and imperforate 1k-5k, complete set of 15 in blocks of four, as well as reference set of singles with different text details and overprint angle, full OG, mainly NH, VF and scarce in complete unit, M. Sadri #R60-73, C.v. $1,340++ (blocks only), Est. $400-$500
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