Paul Wallot (26 June 1841 Oppenheim am Rhein - 10 August 1912 Bad Schwalbach) was a German architect of Huguenot descent, best known for designing the Reichstag building in Berlin, erected between 1884 and 1894. He also built the adjacent Palace of the President of the Reichstag, finished in 1904, and the former Saxon Ständehaus state diet building of 1906 at Brühl's Terrace in Dresden.
This stamp on the maxicard and the card itself were issued on 4th June, 1991 being the 150th Birth Anniversary of Paul Wallot the famous architect of Germany.
Thank you Merja.