Gordon, what's the Latin for, "Life is too short" ?
This is part of that sticky stuff on one's shoe that you have to deal with when you drive a replica. Most people love these cars, and will tell you so without being asked, and regardless of what they drive.
Eventually, though, you will run into Zuffenhausen's anointed people. They have been sent here to do God's work and are tireless in their devotion. They wear the trademark of their religion woven into their garments. The zeal of the true believer is in their eyes. They do not tolerate the infidel in their midst.
For me, life is indeed too short to get bogged down in matters of theology when I just want to be enjoying a sunny day. The few car shows I go to, I attend as a spectator. I park in the parking lot with the rest of the riff raff. If the parking lot is the show - like at a C&C - I have a little card for my windshield (like the one in Jim's photo) that says in big type 'replica' right up top, with some mechanical details below. And if any of the anointed people come calling, I've got the little 'Plastic Car Club' sticker to mess with them.
On the whole, though, I'd rather be driving than parking. I do a C&C every so often more to see than to be seen. I usually get away from the Speedster as quick as possible and let the little card do the talking.
It's in a language laymen can understand.