This is a charming London Underground poster by the French artist Andre Edouard Marty (1882- 1974).
The Cup Final in question was the 1933 FA Cup final, in which a crowd of 92950 saw Everton beat Manchester City 3-0. Everton legend Dixie Dean captained the team that he had a major part in selecting. He also scored Everton's second goal.
The competition rules required both teams to change strip in the case of a colour clash, so Everton wore white and City deep red. Shirts were numbered for the first time in an FA Cup final, but not in the way that became familiar- in this case Everton wore 1-11 and City 12-22. Matt Busby played right half for City.