1906 Olympic marathon (1906 Intercalated Games) wearing a white outfit with a big green shamrock on the chest. Georgios Chatzopoulos, member—and later president—of the club and director of the National Gallery, took over to design the new emblem for the team. Up to the end of the 1970s, a trifolium (green or white) was sewed on heart's side of the jersey and was big in size. With the beginning of professionalism, the crest of the F.C. was created, accompanied by the club initials and the year of founding, 1908. Until today, the team's traditional colours are green and white (green for health, nature, such as physiolatry, and white for virtue), although the white sometimes is omitted, used as trim or as an alternative. During the first years after the establishment of green as Panathinaikos' primary colour, players were wearing green shirts, white shorts and green socks. During the 1930s, an appearance with characteristic horizontal strips was established. This motive was used also in the next decades as primary or second choice. Since then, the uniform style has changed many times, but green has always remained the team's primary colour. Shirt sponsors and manufacturers Since 1979, when football became professional in Greece, Panathinaikos had a specific kit manufacturer and since 1983 a specific shirt sponsor as well. The following table shows in detail Panathinaikos kit manufacturers and shirt sponsors by year: Stadiums and facilities Panathinaikos' traditional home ground since the early 1920s is the Apostolos Nikolaidis Stadium, the oldest active football stadium in Greece, in the Ampelokipoi district of central Athens. The stadium is located on Alexandras Avenue and is most commonly referred to as Leoforos (Greek for "Avenue"). It is considered one of the most historic stadiums in Greece, as it was used by the Greece national football team as home ground for many years (most recently for the UEFA Euro 2004 qualifying matches) and even by Panathinaikos' biggest rivals, AEK Athens and Olympiacos, on various occasions. Panathinaikos left Leoforos in 1984 to play in the newly built Athens Olympic Stadium. In 2000, then-club president Angelos Filippidis announced a return to the Apostolos Nikolaidis Stadium, following a €7 million renovation. Capacity was reduced from 25,000 to 16,620, new dressing rooms were built and modular stand roofing was added in compliance with UEFA requirements, but in 2004, stricter standards were announced and the Apostolos Nikolaidis Stadium would need further expansion were