Thats a cool one. I have a pretty big collection of plates in my mothers garage hanging up, most are personalized from my grandpa and dad. All but one are Texas.
These I have here at the house. The top one is the original plate from Italy that was mounted on our 275 back in 1966. The others are all original as well. I recently looked at some similar plates at the Autorama and they were fetching 300-600 US....I had no idea.