 Much rarer are the "Sieger" covers, carried on Apollo 15.German stamp dealer Hermann Sieger had arranged a deal, in which H. Walter Eierman convinced the Apollo 15 crew members to carry 100 cacheted covers to the moon and back, for the sum of US$7000 each, with the understanding that they would not be sold until after the end of the Apollo program.These covers, along with an additional 300 that the crew would keep for themselves, were stuffed in David Scott's spacesuit pocket, and never listed on the manifest.