Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union - 1934, Civil Aviation, 80k purple, a single with perforation 10x13¾x13¾x13¾, printed on watermarked Borders and Rosettes paper, rough perforation at top as typical for these errors, neat Moscow CTO with full OG, VF and rare, N. Mandrovski certificate, Est. $1,500-$2,000, Scott #C44 var