The photograph shows the signing of the Treaties of Rome on 25 March 1957 by the foreign ministers of Belgium, France, The Federal Republic of Germany, Italy, Luxemburg, and the Netherlands.
Signing the Treaties of Rome, colour photograph, 1957, photographer unknown; source: © Europäische Gemeinschaften, 1992, https://audiovisual.ec.europa.eu/de/photo-details/P-001321~2F00-05