Details:

Clyde Tombaugh autographed First Day of Issue cover featuring the “Old Glory” United States flag stamp, postmarked Washington, D.C., December 13, 1994. Tombaugh has signed the cover in blue ink and added the inscription: “Discovered 9th planet, Pluto, on 18 Feb 1930.”

Fine condition.

Clyde Tombaugh (1906–1997) was the American astronomer credited with the discovery of Pluto while working at the Lowell Observatory in Flagstaff, Arizona. On February 18, 1930, after painstakingly comparing photographic plates of the night sky, Tombaugh identified the celestial object that would become recognized as the ninth planet of the solar system for much of the twentieth century. His discovery represented one of the most significant astronomical achievements of the era and made Tombaugh an enduring figure in the history of space science and exploration.

Authentication:
Includes a full letter of authenticity from JG Autographs, Inc.

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Reference sku: 11667 1415501-1