Information panel in the car window for curious passers-by?

When I park my car, I notice passersby who are interested in looking at it from all sides and of course often have no idea what kind of car it is. “Is this a Cadillac?” is the most common question in addition to the mandatory question about consumption. I have already thought about hanging an information panel in the window – similar to the museum – with essential data about the year of construction, type, cylinder, cylinder capacity etc. What do you think about it?