UNITED STATES of AMERICA. 8c Propellor & Radiator – Dark Green. (1923 Second Air Post Issue). Exceptional centering with balanced margins. The gum is in immaculate condition with no gum bends and no gum skips. The color is vibrant and there are no faults. An exceptional-quality stamp for the selective philatelist. 2023 PF certificate #596413 (graded 98, nh). If you have questions regarding this beautifully centered 8c Second Air Post, please contact Christopher Rupp. Upp Brothers was established in 1975 – our 48th year in business as professional philatelists. Contact Christopher Rupp to sell your superb United States stamps. Well-centered stamps, especially those graded 98, 98J and 100 are sought for a sophisticated and extremely discerning philatelic clientele. Christopher can be counted on to provide collectors with trusted and competent advice. Collectors deserve to receive the full market-value for their philatelic collections. Christopher Rupp will work, on your behalf, to achieve your philatelic and financial objectives.