Guernsey
Iceland
Algeria
Spain
Hungary
CH is Switzerland. It stands for Confoederatio Helvetica
If you mean the international car registration then it is Switzerland
Argentina
Austria
Switzerland, CH stands for Confederatio Helvetica
Spain (E for Espana)
The complication of vehicle registration process varies from country to country. In the United States, the process is simply paying for insurance and taxes.
Liechtenstein is not a republic. It is a principality ("Fürstentum"). The head of state is a prince ("Fürst"). The official name of the country is "Fürstentum Liechtenstein". That is why the international car registration letters for Liechtenstein are "FL".