(ASTRONAUTS--APOLLO 16 & 17.) Two First Day Covers, Signed by the prime crew of Apollo 16 or 17 commemorating the missions of Apollo 16 or 17. The first, John Young, Ken Mattingly, and Charlie Duke. The cachet, a reproduction of a photograph showing the crew at Ellington Air Force Base in Houston, TX on April 29, 1972, which is the date on which, and the place at which, the 8-cent blue eagle embossed stamp was cancelled. The second, Gene Cernan, Ron Evans, and Harrison Schmitt ("H.H. Schmitt"). The cachet, showing the Apollo 17 mission emblem. 8-cent "A Decade of Achievement" postage stamp cancelled in Houston on the date of the command module splashdown: December 19, 1972. Each signed at upper left and lower right or diagonally at right edge. Each 3¾x6½ inches. Np, nd
