31st May 1934, Stadio Littoriale, Bologna. Before the Hungary v Austria match, the process of selecting the match ball. I believe the picture shows Sternberg László (holding the balls) and  Hans Horvath (pointing). Referee Francesco Mattea (Italy) behind Horvath and possibly  Hungary coach Nádas Ödön on the left.
We have seen that in 1930 there was controversy over which ball was used in the final. In Italy 1934 there were 3 different models of ball in use, and the teams would decide which one to use before each game.