This is a beautiful sheet of 4 stamps, issued by Guyana in 2011, displaying Japanese space probes. Featured spacecrafts shown include the Akatsuki Planet-C Venus spacecraft, the KSAT & Negai spacecrafts, Shin'en UNITEC-1 student spacecraft, the Japan Aerospace Exploration Agency (JAXA) IKAROS (Interplanetary Kite-craft Accelerated by Radiation Of the Sun) experimental solar-sail spacecraft, and the Waseda-SAT2 Earth observation satellite from Japan. The sheet is Scott catalog #4055, and is Post Office fresh, mint never hinged, and F/VF.