The American astronauts participated in creating collectables. Beginning in the late 1960s, Harold G. Collins, head of the Mission Support Office at KSC, arranged for specially designed envelopes to be printed for the different missions, and to be canceled on the launch dates. Such unflown philatelic covers were often gifts for the astronauts' friends, or for employees of NASA and its contractors. Although it was not publicly known until September 1972, 15 of the men who entered space as Apollo program astronauts before Apollo 15 had agreed with a West German named Horst Eiermann to autograph 500 philatelic items (postcards and blocks of stamps) in exchange for $2,500. This included a member of each mission between Apollo 7 (1968) and Apollo 13 (1970). These items were not taken into space.