Variant I had on these conversations when an elderly gent saw me on the street with the three wheeler;

EG: "Is it a Morgan?"
Me: "yes"
EG: "Is it original?"
Me: "err, yes"
EG: "What year is it?"
Me: "It's an oh-12"
EG: "how wonderful to see these old things out being used" and then wanders off smiling happily...