The ancient sheet of pink paper is hand-signed by Dulwich Hamlet's England international goalkeeper E.H. 'Tim' Coleman. Coleman kept goal for the Hamlet either side of the First World War and was a member of the Victory side of 1920. That team won the double - the Isthmian League and the FA Amateur Cup, and one or two other pots as well.
Coleman played for the full England side eight years before Edgar Kail made his three apearances.
Coleman gathers the ball for England v Wales in Cardiff, March 1921.
The Dulwich Hamlet Pop-Up Museum will be open on the afternoon of Saturday 7 May. On display will be another of 'Tim' Coleman's signatures. This one with the whole Hamlet team on the back of a postcard. The exhibition is for one day only - opening at 2:00pm until 5:30pm. We look forward to seeing you.