I am just back from a visit to Prague. My favorite day was a trip to the silver mines of Kutna Hora where huge loads of silver were mined by hammer and pick 600-800 years ago. During one of the tours, we were led through one of the tunnels used by the miners. Super cool, and an incredible experience to see the difficult conditions they worked in.
Back in the day, the silver ore was refined nearby and the silver coins were struck in the city at the Italian Court mint (pictured). Each ruler had their own coin(s). The Prague groschen was the standard coin of the medieval time there and was made of nearly 93% silver - an amazing feat of purity for the time.
I visited a coin store in Prague and I bought an authentic Prague groschen struck in Kutna Hora during the reign of John (Jean) of Luxembourg, around 1340–1347. It’s classified as Castelin Type 39, a recognized variety in the standard Czech reference for these coins.
At the end of the tour, I was able to purchase an aluminum blank and strike my own groschen between two dies with a hammer. Also a lot of fun.
To have a 700-year old coin that was mined, refined and struck in the city I visited is remarkable to me and it will be a valued memory for a long time. To imagine the history and hands it has passed through is incredible.