Hermann Oberth and James Van Allen

Two covers signed by a notable space pioneer: an FDC with a cachet honoring Robert Goddard, postmarked at Roswell, New Mexico on October 5, 1964, signed in black ink by James Van Allen; and a commemorative cover with a color Skylab 3 cachet, postmarked at Cape Canaveral on July 28, 1973, the docking date of Skylab, signed in blue ballpoint by Hermann Oberth. In overall fine condition.