The Fussball.de website is currently running an interesting story, which was new to me. Apologies if everyone already knew of it.
In 2002 to celebrate the centenary of the Norwegian FA, a set of postage stamps was issued. One was to feature the then prominent referee, Lars Johan Hammer. Unfortunately, when the image was sent to him for approval, he did not look carefully enough, as the referee in the photo was not him, but a lower-league official from Brandeburg in Germany, Peter Hertel. He had been involved in the Norway Cup and somehow the photos had become confused. As a result, the Norwegian centenary was celebrated with a referee wearing a Brandenburg badge.
As a result Herr Hertel enjoyed a spell of "fame" with TV interviews and appearances at stamp-collecting conventions. He is still active, or was until the lockdown, having been a referee for 40 years.