This is a sample plate of San Marino. I haven't got any yet, but I know how you can get one. They cost about 15 Euros, plus about 8 Euros for shipping (at least it's so much to Europe) and you must request it at the following address:
Ufficio Registro Automezzi
Via delle Carrare, 42
Repubblica di San Marino
tel: 0549 887100
fax: 0549 887115
I need to thank Antonio Carretta for the picture of this sample plate.
If you want to see other plates of this kind, go to the page of sample plates.