Another great player from this era was José Luis Panizo. In 1943, the club won a double of Liga and Copa del Generalisimo (the new name of the Copa del Rey) and they subsequently retained the Copa in both 1944 and 1945. During the early 1950s, the club featured the legendary forward line of Zarra, Panizo, Rafa Iriondo, Venancio and Agustín Gaínza. They helped the club win another Copa del Generalisimo in 1950. The arrival of coach Ferdinand Daučík improved the club's fortunes further. He led the team to another double in 1956 and to further Copa del Generalisimo victories in 1955 and 1958. In 1956 the club also made their debut in the European Cup, eventually being knocked out by Manchester United. What helped the club succeed in the 1930s, 1940s and 1950s were the strict limits imposed on foreign players. In most cases, clubs could only have three foreign players in its squad, meaning that at least eight local players had to play in every game. While Real Madrid and Barcelona circumvented these rules by playing dual citizens such as Alfredo Di Stéfano, Ferenc Puskás, José Santamaria and Ladislao Kubala, Atlético adhered strictly to their cantera policy, showing little or no flexibility. The 1960s, however, were dominated by Real Madrid, and Atlético only had a single Copa del Rey win in 1969. Like international teams, the club has used the "grandparent rule", allowing the recruitment of some players of Basque descent. This enabled the Barcelona-born Armando Merodio to play for the club. During the 1960s, however, other players such as Jesús María Pereda, Miguel Jones and José Eulogio Gárate were overlooked. Although none of them were Basques by birth, all three grew up in the Basque Country and could be classified as naturalised Basques; Gárate even had Basque parents. On a positive note, the 1960s saw the emergence of a club legend José Ángel Iribar. The 1970s were not much better, with only another single Copa del Rey win in 1973. In December 1976, before a game against Real Sociedad, Iribar and Sociedad captain Inaxio Kortabarria carried out the Ikurriña, the Basque flag, and placed it ceremonially on the centre-circle – this was the first public display of the flag since the death of Francisco Franco.