UNITED STATES of AMERICA. 8c Propellor & Radiator – Dark Green. (1923 Second Air Post Issue). First Day Cover – Washington, D. / Aug 15 1923. A nicely centered and bright stamp, tied on an. Exceptionally fresh cover to Edward C. There are no faults, a very fine cover. If you have questions regarding this high-quality First Day cover, please contact Christopher Rupp. Rupp Brothers was established in 1975 – our 49th year in business as professional philatelists. Contact Christopher Rupp to sell your quality United States stamps & covers. Choice stamps and unusual covers are keenly sought for a sophisticated and broadly-interested philatelic clientele. Christopher can be counted on to provide collectors with competent and trusted 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.
