GREAT BRITAIN (1987) Isaac Newton*. Unaddressed FDC with cachet. Scott Nos 1172-5.
AVAILABLE AT $10
U.S.A. (1948) George Washington Carver*. FDC with cachet and First Day cancel. Scott No 953.
AVAILABLE AT $10
PARAGUAY (1965) Newton*. Galileo*. Copernicus*. Einstein*. Set of 7 on 2 unaddressed FDCs with thematic cancels. Scott Nos 871-8.
AVAILABLE AT $20
HUNGARY (1974) Janos Segner*. Water wheel*. FDC of imperf with cachet and thematic cancel. Scott No 2312. Considered the father of the water turbine.
AVAILABLE AT $15
GREAT BRITAIN (1987) Discoveries of Isaac Newton. Addressed FDC with official cachet. Scott Nos 1172-5.
AVAILABLE AT $25