Free State of Saxony Geocoin
Why didn't something like this exist yet?
Well timed to the MEGAs in the Vogtland and in the Lausitz there is now a Free State of Saxony Geocoin.
If the design is so well received, I could very well imagine that other federal states will follow (if MEGAs take place there...).
The coins are 80.0 x 60.5 x 4.5 mm in size and weigh an impressive 75 grams.
Of course, the coins can be tracked on Geocaching.com and have their own icons: