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CLYDE WILLIAM TOMBAUGH - FIRST DAY COVER SIGNED CO-SIGNED BY: FRED LAWRENCE WHIPPLE, LUBOS KOHOUTEK - HFSID 63582

ASTRONOMERS Three astronomers sign a philatelic envelope commemorating the 200th anniversary of U.S. postal services. Philatelic Envelope signed: "Clyde W. Tombaugh", "Fred L. Whipple" and "Lubos Kohoutek", 6½x3½. First Day Cover commemorating the 200th anniversary of U.S.

Sale Price $255.00

Reg. $300.00

Condition: fine condition
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ASTRONOMERS
Three astronomers sign a philatelic envelope commemorating the 200th anniversary of U.S. postal services.
Philatelic Envelope signed: "Clyde W. Tombaugh", "Fred L. Whipple" and "Lubos Kohoutek", 6½x3½. First Day Cover commemorating the 200th anniversary of U.S. postal services, 10-cent stamp picturing space satellites affixed, postmarked Philadelphia, September 3, 1975, FIRST DAY OF ISSUE. CLYDE W. TOMBAUGH discovered the planet Pluto in 1930. FRED L. WHIPPLE theorized in 1950 that a comet is a ball of icy substances of gases and dust a few miles in diameter, calling them "dirty snowballs". LUBOS KOHOUTEK discovered the comet which bears his name in 1973. Fine condition.

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