Hi
in Germany, as well as in Switzerland we know such a kind of collectors registration. You will get one plate for all the cars you have registrated for changing it between the cars. And you have to note all drivings. In Germany only permitted for collectors cars driving to club meetings and for repair,calibrating or selling drivings. But as you know, especially the french cars have to be checked and calibrated very often after enduring repairs! Ad this only can be done under loads, so the family has to drive with me.
;-)
Andy