Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1978-80, Wright Brothers 31c, two blocks of four, each one is containing two vertical se-tenant pairs, first one has all offset colors strongly shifted, the other one with all offset colors almost missing, both with full OG, NH, VF, Est. $150-$180, Scott #C92 var