UNITED STATES of AMERICA. (1991 Air Post Issue). GEM-OG-NH, exceptional centering with balanced margins. The colors are bright and the gum is in immaculate condition. There are no faults. With the HIGHEST grade on the PSE Population Report. 2007 PSE certificate #1144934 (graded 100, nh). Rupp Brothers was established in 1975 – our 49th 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 collection. Christopher Rupp will work, on your behalf, to achieve your philatelic and financial objectives.