Flag of Rosario City.
Government of Rosario (vector graphics file by <a href="//commons.wikimedia.org/wiki/User:Andres_Rojas" title="User:Andres Rojas">Andres Rojas</a>)
1862
Government of Rosario webpage <a rel="nofollow" class="external autonumber" href="https://www.rosario.gob.ar/inicio/escudo-y-bandera-de-la-ciudad">[1]</a>