The imperial mum cups (both silver and wood) as well as the kiri leaves cups were officially awarded in the Medals of Honor category. There were 5 sizes of silver mum cups, and sets of 3 as well as single cups were given. Many specific details are in my ebook on Medals of Honor (shameless plug). Here is a section detailing some who received the silver mum cups: 1 Someone who has exhibited long years of public service, but has done nothing extraordinary that would merit a medal. For example, one who has been a priest in a temple for many years, one who has been involved in education for a long time, etc. 2 Someone who has received a medal and then done something afterwards that was distinguished but not special enough to warrant a step in rank to the next higher medal. 3 Someone who was involved in a special event. For example, Olympic gold medalists and Nobel Prize winners will receive a silver cup award. In addition, people involved in the contruction of major public projects (dams, bridges, tunnels, etc) often receive silver cups upon completion.