World Games Wrocław 2017, Imperf. (Poland 2017)

Souvenir Sheet World Games Wrocław 2017, Imperf. it reflects the thematic directions:

American football (referred to simply as football in the United States and Canada), also known as gridiron football, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.

Sport is a form of physical activity or game. Often competitive and organized, sports use, maintain, or improve physical ability and skills. They also provide enjoyment to participants and, in some cases, entertainment to spectators. Many sports exist, with different participant numbers, some are done by a single person with others being done by hundreds. Most sports take place either in teams or competing as individuals. Some sports allow a "tie" or "draw", in which there is no single winner; others provide tie-breaking methods to ensure one winner. A number of contests may be arranged in a tournament format, producing a champion. Many sports leagues make an annual champion by arranging games in a regular sports season, followed in some cases by playoffs.