Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - 1991, Harriet Quimby, 50c multicolored, left sheet margin block of four imperforate horizontally, USPS imprint on selvage, tiny wrinkle at the bottom of lower left stamp, full OG, NH, VF, C.v. $1,600 as two pairs,Scott #C128a