RSM San Marino: test plates RSM

I don't know much about test plates of San Marino: in the picture below you can see one of them, but I don't know if it's still in use or if it was replaced with e new one made with polychromatic techniques, as it happened for the passenger plates.

Many thanks to Alessandro Libanore for this nice picture.

Test plate from San Marino

Plates in Rome by Michele Berionne