AUSTRIA (1996) "Power Station" by Reinhart Artberg*. Black proof. Scott No 1711, Yvert No 2034.
AVAILABLE AT $15
FRANCE (1989) Balloon*. Red meter cancellation on cover front No 1987: "The Primagaz group, the energy to go farther."
AVAILABLE AT $15
GREAT BRITAIN (2000) Wetlands*. Ants*. Solar cells*. Leave in water*. Addressed FDC with cachet and thematic cancel. Scott Nos 1902-5.
AVAILABLE AT $12
MALI (1976) Space ship with solar batteries*. Die proof in black signed by the engraver JUMELET. Future space series. Scott No C276, Yvert No PA272. Rare!
AVAILABLE AT $140