Altonaer FC von 1893
"Altona" is one of Germany's oldest football clubs: they were part of the Altona-Hamburg football league formed in 1894, as well as one of the founding clubs of the German Football Association (Deutscher Fussball Bund or German Football Association) at Leipzig in 1900. In 1903 at their home ground, they hosted the first-ever German national championship final played between "VfB Leipzig" and "DFC Prague". The match was refereed by "AFC" player Franz Behr, who also served as the vice-chairman of the newly formed DFB until 1904. The club rescued the match by providing a new ball when the original one proved to be unsuitable for play. The hosts of the country's first title match never won or even played in a national final, being able to advance only as far as the semi-finals in 1903 and 1909, and the quarter-finals in 1914.
Hamburger SV
Soon after, Germany's first professional football league, the Bundesliga, was formed, with HSV one of 16 clubs invited to join that first season. Hamburger SV held the distinction of being the only original Bundesliga side to have played continuously in the top flight – without ever having been relegated – from when the league was formed in 1963, until they were relegated in the 2017–18 season, finishing in 17th place. They had shared that special status with Eintracht Frankfurt and 1. FC Kaiserslautern until 1996, and with 1. FC Köln until 1998. Altogether, 49 other sides have come and gone since the league's inception. The Bundesliga celebrated its 40th anniversary on 24 August 2004 with a match between "The Dinosaur", as the club has been affectionately nicknamed due to its old age, and Bayern Munich, the league's most successful side.