One of the interesting facts is that one can be a Monaco car licence plate holder without being actually a resident of the Principality of Monaco.
Typically, anyone who has a Monégasque ID card or a residence permit can register his/her vehicle in the Principality. However, in the case that you do not have a residency in Monaco, but own a Monaco-based property, and can prove that you have a parking space for your car for the period when you are not in the Principality of Monaco, you are also eligible to request the registration of your vehicle in the Principality of Monaco on an annual basis.
The annual car license plates have a very interesting function.
The Monégasque coat of arms is engraved on the left side of the rear plate with the year number to attest that tax has been paid. By updating your license plate you also prove that you paid all your duties, less than a 100 Euros a year.