This is a beautiful sheet of 4 stamps, issued by St. Thomas & Principe in 2009, depicting conquests of space. Featured on the stamps are the Delta II space launch system, Ariane 5 European heavy launch vehicle, the US Skylab space station, the Long March 4C Chinese orbital carrier rocket, the Highly Advanced Laboratory for Communications and Astronomy (HALCA) MUSES-B Japanese radio telescope satellite, and the Atlas V expendable launch system. The sheet is Post Office fresh, mint never hinged, and F/VF.