A commemorative envelope issued in Germany in 2023 to commemorate the 550th birth anniversary of mathematician and astronomer Nicolaus Copernicus. The stamp at top-right that is pre-printed on the envelope is the 2009 Europa stamp for which the theme was astronomy. The €0.30 label below it is also pre-printed on the envelope (because €0.55 was not enough for domestic postage in 2023).
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