A Gaia stamp
Tuesday, 16 January, 2018
On 7 December 2017 at 11:00 a German “Gaia-satellit” stamp was released along with a stamp on gravitational waves. Both stamps are part of an astrophysics series of the Deutsche Post. The Gaia stamp is based on a combination of the Gaia satellite and a background image of the Milky Way as obtained from ESO / S. Brunier and happens to be the first German stamp using a metallic coating.
More information here