Denys O'Brien's Football Poster

My father was a pilot who was training in Rhodesia. He qualified just before the war ended and therefore didn't see active service. I have quite a few photos of his time out there in the RAF. He was very sporty and played a lot of football during his lifetime and whilst in Rhodesia. After his death, we found a beautiful hand-drawn poster of a football match between an RAF team and a prisoner of war team. It's unusual because the date on the poster is 9th April 1947. I'm sure my father had been de-mobbed by then and started his banking career. He was a prolific goal scorer so we can only presume he was asked to join the team. We never saw the poster during his lifetime and he never spoke of it.