Covid-19 Solidarity in Switzerland

On Friday I got a stamp from Switzerland in a cover.

This is it:

Covid-19 Solidarity (issued 06-04-2020)
Switzerland was very quick with the issuance of this stamp, it was designed in just six days. Switzerland is thus the third country in the World with a Covid-19 stamp after Iran and Vietnam and the first in Europa. The stamp however is quite expensive and only sold in sheets of ten. The high price is because the stamp includes a donation for the good cause. The inscription is slightly misleading. It says 100+500, but actually the stamp is sold for "only" 5 francs which are donated completely and in return you can use the stamp as postage of 1 franc. Within the first ten days already more than half a million francs were donated with the stamps.

Thank You very much Yue!