One of the most valuable medals in the history of the spa springs Bílinská kyselka and Zaječická bořká voda of the Lobkowicz Directorate of Springs is the gold medal from the first Hygienic Exhibition in Dresden. This exceptional event was visited by more than five million people.
https://www.dhmd.de/cs/dejiny-muzea
https://en.wikipedia.org/wiki/International_Hygiene_Exhibition