Unknown Medieval Ancient Coin Hammered Silver [opgelost]

Hello, I have the following coin that I would like identified. Thanks, Nathan.

Try Livonia or Poland-Lithuania

Preference for https://en.numista.com/catalogue/pieces41643.html

I searched Numista for all coins pre 1600 and less that 18 mm (a mercury dime), and the closest thing I saw was the following coin from Scotland: https://en.numista.com/catalogue/pieces55284.html

I wish I could find out what that thing is on the first picture. A dinosaur, flower...?

My coin is after 1600, this would explain.

There is a default on the 1st pic, but this is the coat of arms of Riga (the file is not translated from French to English)

It is clearly a solidus.
And I read a couple of letters of Christina.
So it is Poland, Lithuania or Livonia as Chomp-master suggests.
Or Polish-Lithuanian commonwealth.
https://en.wikipedia.org/wiki/Polish%E2%80%93Lithuanian_Commonwealth
The house of Vasa were also rulers in Sweden.
Is it this Christina ? :
https://en.wikipedia.org/wiki/Christina,_Queen_of_Sweden

Only the two keys seems different.

The side with the name Christina has the arms of the Vasa (Wasa) dynasty (Sheaf of grain)
https://en.wikipedia.org/wiki/House_of_Vasa

Corrections welcome