Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Liberia - 1941, First Flight Liberia - US, inverted surcharge 50c on 2c red orange and inverted overprint on $1blue, full OG, NH or LH (2c), VF, each one with experts' signs, C.v. $300 as hinged, Est. $150-$200 , Sc. #C18, C26 var