Aleksandar Cosa Seifert the legendary coach of Mladost Zagreb winner of the 1967, 1968, 1969 and 1971 European Club Championship while coaching his players and future successful Coaches Ivo Trumbic (Nr.2) and Ozren Bonacic (Nr.3). Seifert was the coach of the Yugoslav National team winner of the bronze medal at the 1966 European Championships in Utrecht and the first gold medal for Yugoslavia at the 1968 Olympics in Mexico City.
Source: A century of Croatian Water Polo
