U.S.A. (1940) Beaver*. Red meter cancellation on piece Pitney Bowes No 169508: "Beaver tools are workin' fools."
AVAILABLE AT $20
UNITED NATIONS (1989) Hydroelectric dam*. Set of 6 imperforate progressive proofs. Scott No 546, Yvert No 559. World Bank. From the UN printer archives. Rare!
AVAILABLE AT $50
GABON (1973) Kinguélé Dam & Hydroelectric Station*. Deluxe sheet of triptych. Scott No C140a, Yvert No PA140a.
AVAILABLE AT $40
BELGIUM (1977) Gileppe dam. Yser war memorial. Scott Nos 985-6. Yvert Nos 1848-9. EUROPA issue. Deluxe proof (LX66).
AVAILABLE AT $80
BELGIUM (1977) Gileppe dam*. War memorial*. FDC with cachet and thematic cancel. Scott Nos 985-6, Yvert Nos 1848-9.
AVAILABLE AT $5
GABON (1968) Dam*. Power station*. UNESCO emblem*. Imperforate pair. Hydrological Decade (UNESCO). Scott No 227, Yvert No 226.
AVAILABLE AT $10
MADAGASCAR (1967) Weather satellite*. Dam*. Electric grid*. Deluxe sheet. UNESCO Hydrological Decade. Scott No 404, Yvert No 439.
AVAILABLE AT $12