After the success of the Satsuma Han 1867 medal distributed in Paris, the Tokugawa Bakufu decided to make an official medal. Although meetings were held and the design had been decided upon, the Meiji Revolution (1868) halted those plans. The original medal (if ever made) and the original designs have been lost.
However, in 1991 an historian found some documents alluding to the original design, so he published an article about what it possibly could have looked like. The Tokugawa Museum in Chiba decided to make some replicas in 1997. A name was also given: The Tokugawa Hollyhock Medal, hollyhock being the name of the plant in the crest. Of course, the medal name is a modern invention.
The center emblem is the family crest of the Tokugawa family, and two dragons encircle it.