The Silver Medal in Diplomacy was an award given by Federation allies to exemplary individuals every ten years.
In 2349, Captain Jean-Luc Picard was presented with this award and was given a plaque in commemoration of the event. This plaque was stored in Picard's section of the quantum archive at the Starfleet Archive Museum. . (PIC: "Remembrance")
The plaque was one of the props displayed at Comic Con's exhibit Jean-Luc Picard: The First Duty in the summer of 2019. [1]