Denmark – Scott # 785, used
$0.50A used 1985 Danish stamp honoring physicist Niels Bohr on the centennial of his birth.
Scientist
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Germany – Scott # 800, used
$0.50Germany Scott #800, used, 40 pfennig definitive featuring Alexander von Humboldt in a finely engraved portrait.
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Vatican City – Scott #s 537-40
$0.50Vatican City Scott 537–540 (1973) MNH set commemorating the 500th anniversary of Nicolaus Copernicus, featuring portraits and views of his birthplace, Toruń.